Samsung Galaxy S5 vs Sony Xperia Z2 vs HTC One M8

Biggest Android phone makers globally has now revealed their flagship weapons. Samsung and Sony launched their phones  Galaxy S5 and Xperia Z2 respectively in last month's mobile world congress in Barcelona. Every one has eyes on HTC because they were excited about their new HTC One that how it will compete the other giants. Now after launch of HTC One M8, we can easily compare these beasts face to face. So lets start competition of the year between Samsung Galaxy S5 vs Sony Xperia Z2 vs HTC One M8.

Power

All these three phones are equally powered by latest Qualcomm Snapdragon 801 processor. Which is clocked at 2.3 Ghz. 

If you look for RAM then Xperia Z2 is one step ahead with 3 GB RAM where Samsung Galaxy S5 and HTC One M8 only have 2 GB of RAM. 

So, in power department Xperia Z2 is ahead of the other twos.

Camera

Samsung have put a 16 MP rear camera which is capable to shoot 4K videos.

Sony has integrated their award winning Exmor RS sensor of digital camera technology in this phone same like Xperia Z1, but they have improved it's camera clarity and low light photography functionality.

On other hands, HTC One M8 is having 4 Ultra pixel sensor with dual flash, this HTC trademark technology really gives very good images specially in low light conditions.

Display

If we compare display of them then HTC One M8 is having 5 inch display where Samsung Galaxy S5 and Xperia Z2 is having 5.1 inch and 5.2 inch display respectively. But both of them have used different technology like S5 is having Super AMOLED display where Z2 is having IPS display panel.

Software

All these threes are having latest Android KitKat 4.4 OS. Samsung have flavored this OS with their own and newly tweaked TouchWiz interface. Xperia Z2 is also having their proprietary customized KitKat 4.4 OS. And HTC One M8 is also having this OS with Sense UI. Thus all of them having ultimate Android experience.

Verdict

Deciding best phone amongst these three phone is quite difficult, because it is based on you that which phone suits your user experience. But if you are struggling to control your patience then the benefit of the HTC One M8 is that you can buy it immediately, wherees S5 and Z2 will be available in some weeks.So, you have to wait.

You can also refer our full in depth review for Samsung Galaxy S5 here.

Unlocking Sony Xperia C

These days spotting a Smartphone is just as easy as it is to find potatoes in the street. Traditional mobile devices have been overtaken by Smartphones and it is almost impossible to imagine life without them. They’ve made everything fast and easy! You can now send emails and text messages, share photos and videos, check temperature and sports updates, and do everything else on the move – with your high-tech Smartphone.

Unlike traditional models, Smartphones do not just offer voice calling features – they also provide great interactive add-ons like video calling and Internet browsing. In short, a Smartphone is like a mini-computer that gives you access to all apps that you earlier used only on laptops and computers. You can work on MS Powerpoint presentations, send emails, capture high-resolution photos, perform Google search, update your Twitter account and much more.

Just like there are hoards of Smartphone models available in the market, so are their makers. Some of the popular Smartphone manufacturers include Sony, Apple, Samsung, Nokia, Micromax, Blackberry, HTC etc.

With several model launches under its ambit, Sony has been able to grab a decent market share. The company recently launched Sony Xperia C – a model that has managed to receive favorable reviews due to its competitive pricing, appealing design and reliable battery life. While there have been mixed reviews in terms of performance, display and camera quality, Xperia C is still the love of many. And if it’s yours too and you own one – get it unlocked now!

‘When you purchased the Xperia C, it was unlocked for use with a specific connection. But you would sure want to change your service provider at some point. To be able to do so, you need to get it unlocked with the help of a unique 16-digit unlock code that is easily available from a third party onlin agency.’

Why is it important to unlock the Sony Xperia C?

Well, there are a number of reasons to free up your phone by getting it unlocked. Read below to know why:

·         If you’re travelling abroad and your phone is locked, you’ll have to pay hefty roaming charges as you wouldn’t be able to change the connection to the one used in that country. So get your phone unlocked in order to use any SIM worldwide and thus save your huge roaming charges.

·         An unlocked phone has a higher resale value.

·         You get the freedom to choose a network connection of your choice – thus enabling you to control your bills, monthly spend and more.

In case you are clutched with any apprehensions about unlocking, it will be great to know that unlocking is 100% legal. And in instances where your phone is not unlocked successfully, there is 100% money back guarantee. Unlocking your Xperia C is:

1.    Quick and simple
2.      Onetime process

How to unlock your Sony Xperia C?

Unlocking a phone is highly preferable not just because it frees you to use any network, but also because it is a hassle-free process.  All you need to know is your phone IMEI number, which is easily obtainable by dialing *#06# from your keypad. Get the unlock code for your phone from smartphoneunlockers.com. Other than this you need to mention your current network connection and email ID in your purchase order. Once you confirm the order and make payment successfully, you receive the unlock code on your email ID instantly.

What next?

Once the 16-digit unlock code is there on your email ID – change the SIM on your device to the non-accepted one. When your phone asks for the unlock code – you just need to enter the code received on your email and your device will be ready to use!

Important!

It is important to take care of a few things before placing your order online. You need to check before hand for the number of attempts that are left to enter the unlock code. Other than this:

·         Recheck the IMEI carefully before submitting the order

·         In the order, mention the current network provider and not the one that you want to use

     Happy unlocking!

Problems with Windows Phone OS

Microsoft is said to be emperor in Desktop Operating Systems market. They are like synonym to PC and also for laptops. Almost all these computers are installed with Microsoft’s Windows OS. But today, the whole picture is changed. Mobile phone market has overshadowed computers market and everyone measures technology with mobile phone markets.  Currently, Apple’s much anticipated iOS and Google’s Android has conquered mobile phone OS market. And it was in October 2012 when Microsoft also entered in this market with their Windows Mobile OS and tried to make some good numbers in this market. After almost one and half year, still Microsoft is significantly lagging behind iOS and Android.

In this article I am going to discuss about what are the major problems and issues in Microsoft’s Windows Phone OS. I am writing this article by experiencing these by using Nokia Lumia phones, which are exclusively using Windows OS. First of all, let me clear that the hardware used by Nokia is great. According to me, they are still best hardware manufacturers. No problem with Nokia’s hardware. But the problem is inside of the phone, the much important part Operating System. Now let me come to the point and start to describe these issues.

1. No app transfer to micro SD card

Normally all Android phones comes with 4GB or 8GB of internal storage and even Windows phones also comes with these capacity. In Android phones, you can transfer your apps data to SD card and install more number of apps in your phone, in Windows phone it is a limiting factor. You cannot transfer apps into SD card.

Another issue is the apps designed for Windows phone consumes more space than Android games. For example, popular game Subway Surfer comes with a size of around 40MB on Android platform and same game comes with size of around 80MB on Windows platform. It clearly means that you will not be able to install more apps and games on your phone. 

2. Not having own file manager

This is probably one of the biggest drawback of Windows phone, you cannot get a native file manager app for your phone. You would be able to install third party file manager apps but still it is having limiting factor like you have one Read Only permissions of your SD card using your file manager. It’s kind of frustrating thing that you are not able to use all storage capacity of your micro SD card effectively.

3. Absense of LED notification light

Normally all Android phones comes with physical LED notification light which will blink whenever you will be having any missed call, Whatsapp message or a Facebook notification. On my Sony Xperia phone, whenever I have Whatsapp message it blinks with violet color, for Facebook notification it turns into blue and for a missed call it blinks with green. So it helps me a lot in everyday life of use. For a Windows phone, you will not be able for get this facility in any single model. This feature is more important if you are a busy and heavy user of Whatsapp and Facebook. 

Sony Xperia phone with notification light 

4. Notification bar problem

Biggest advantage of Windows phone is its Metro UI called Tile interface. It’s actually very innovative and easy to use this look. But it does not give you all notification in single screen. Like you have to scroll up and down to see notifications in their respective tiles. In Android phone, even latest iOS7 also have it's native notification bar in top of the phone and you will be able to see each and every notification very easily. 

Different notifications in their respective tile in Windows Metro UI

5. Not having integration with Google apps

If you are a heavy user of Gmail, Google Maps, Youtube and other native Google services then you will not have a good experience with Windows phone because Google does not provide their own apps for Windows mobile platform. You will be restricted to use Google services on Windows phone.

6. Instant toggle to specific shortcuts 

For Android and iOS phones, if you want to switch on/off Bluetooth or Wi-Fi then you can do it just in one click. You can get same other features like mobile data traffic, NFC, profile, auto-rotate shortcuts in upper notification bar. Thus you can toggle to specific setting very quickly. But this is not possible in Windows phone. You have to make at least 2-3 steps for starting that service. You can create these type of shortcuts in Windows phone, but again they will still require 2-3 steps.

shortcuts in notification bar in normal Android phone

7. USB OTG not supported

Windows phone does not support UTG OTG and it is kind of limiting factor when you want to use your other devices with your Windows phone. It means that you cannot connect USB flash drive, music player, digital camera or keyboard to your phone. 

8. Not support to third party web browsers

This is one of the biggest problems because without good internet browser you cannot use your phone effectively. Windows phone comes with default browser Internet Explorer and it also supports UC browsers and some less known ones. But still it misses some biggies like Firefox, Chrome and Opera Mini browser. So it is a huge drawback with Windows phone.

So, these are some issues or problems which I noticed in Windows phone OS. If you are agree with me or even don’t agree with me then also mention your precious comment below. Thank you and enjoy my other articles. 

Android vs iOS vs Windows Phone OS

Before 5 years, we were only aware about Windows XP and other flavors of OS, which are used in computer. But at present, the scenario is changed. Most of the electronics and technology companies are concentrating on mobile phone industry. This industry is facing extreme hard competition. And the key part in these all mobile is it's OS, operating system. 

This trend started  when Apple entered in mobile phone industry with iPhone and introduced their proprietary OS called as iOS. It was revolutionary. Then Google came into the game with Android OS. In quick span of time, Android become hit and conquered worldwide OS market by featuring in Samsung, Sony, HTC like mobile phones. So now at present scenario where each OS stands in competition? We will compare them. 

Right now, the latest versions are Android is 4.4 Kitkat, iOS and Windows Mobile 8. Let's compare them.

iOS7, Android Kitkat & Windows Phone screens

User Interface:

Apple introduced iOS7 recently and in this version they totally changed their overall look of the interface. It is now more 2 dimensional and clean. Apple says that they used concept of simplicity in new iOS7. Overall it is very user friendly and clean interface. 

We all know user interface of Android and the current version 4.4 Kitkat is also very similar to its predecessors. It has multiple home screen, inclusion of Google Now, feature rich built in apps, everything this Android 4.4 have. People call Android interface old but I must say that it is the easiest interface currently any mobile phone having. 

Now be ready for a surprise, because Windows Mobile 8 OS interface is best interface according to me. The inclusion of "LiveTiles" gets maximum point for this. It provides you maximum information in quick time. 

Overall all of the three OS have very good interface. In iOS & Windows OS, you only get limited customization. But for Android you can apply maximum tweaks.  

Apps:

iOS top this list with more then 6,50,000 applications. They also offer apps for iPads. 

Android Play Store have 6,00,000 apps and those apps can also be used on android tablets. 

Windows phone currently offers significantly low apps around 1,00,000 apps on their Windows Store. And still, they don't offer any app for tablets.

Camera:

iOS7 came with significant changes in camera app with more photo effects, live picture filter., etc. It is a sophisticated camera app provided in iOS7.

Android camera app has maximum flavors. Because Samsung has their different camera app, HTC offers their own customized app and same for others like Sony,Huawei, LG. They all gave a different look to camera app and included many innovative features. Like 360 Panorama, smile shutter, Burst mode.,etc.

Windows OS is relatively new and so their camera app is cleaner and easy with minimum on screen setting. But you can take more natural photographs and  even use a separate camera app by putting in default mode. 

Android Kitkat & iOS7 notification bar

Control Panel:

This is very key part of any OS. Because control panel or if you call it notification bar is feature which will get your most of attention when you are using it. 

Android have large experience in terms of notification panel. You can access it by swapping down the upper screen of OS. It gives customizations for WiFi, Bluetooth, Profile,. etc.  Even all new notifications and events displays on this bar very well. 

iOS started their affair with the notification bar in this new iOS7. It also offers same functionalities like Android panel. 

Windows Phone do not support any notification center or control panel like Android or iOS. Because their LiveTiles always blinks new notifications separately. But still you may miss this key feature in Windows phone. 

Multi Tasking:

In this feature also iOS was not there before introduction of iOS7. But now you can easily switch between apps to achieve multi tasking. This feature is borrowed from Android by iOS because it is very similar to Android. 

Android provides this feature from Android 4.0 ICS. You can access this by long pressing Home screen button. You will get a quick window of running apps and can switch among them. 

Windows Phone also offers the same kind of multi tasking by long pressing Back button.

Conclusion:

Overall, if you look at previous given key points then clearly understand that all of the OS have their own charm and key features. Like on iOS, you can get user friendly environment and cleaner look. Android offers maximum offers and customizations. Wheres, Windows Phone gives a clean and refreshing look by LiveTiles. And each of them has their own drawbacks. 

Android have the highest number of users, but most of them are using old versions like 2.2 & 2.3. Windows is relatively new and having very less users. iOS7 looks one step ahead if you look at overall scenario. Because it offers everything which you want and more importantly, they have maximum users who are running on their latest iOS7. So, its on you and your personal choice that which OS based phone you have to buy. And please give your precious suggestions to me in the comment box below. I am always trying to improve my article for your suggestions. 

LCD vs TFT vs AMOLED : Display Comparision

These days screen size of any mobile phone is benchmark to compare them. The more it will be big, more you will be impressed. But technology behind that screen in not much known for most of us. Even if the persons who know about LCD, TFT, IPS, AMOLED, SUPER AMOLED will be also confused that which one is better. 

These displays are generally having two main types. First one is LCD & second one is AMOLED. We know name LCD because it is used in the wide range of electronic products. But most of us are not aware about AMOLED. So let's discuss about it. 

LCD:

LCD, liquid crystal display is made of wondrous liquid crystals. In which these crystals are combined between two couple of glasses with the use of the light source. They produce most realistic colors, but they does not represent much wider contrast ratio if we compare them with AMOLED.

TFT & IPS are also based on same LCD technology. TFT which is Thin Film Transistor & IPS is In Plane Switching. 

TFT makes LCD much efficient by making it's wiring reduced and also reduces electrodes per pixel. TFT improves image quality of LCD display.

IPS is improved from TFT by offering much better color reproduction and more accurate viewing angles. 

LCD is used in most of Sony, HTC, iPhone., etc. 

AMOLED:

AMOLED stands for Active Matrix Organic Light Emitting Diode. 

It is old technology but gained popularity in recent days. In this technology, a thin layer is made from thin layers which is zapped by an electric current. One major advantage of this technology is, it can create much thin layers and also do not require back light. This means it can create much better black colors and reduces battery usage because the back light is not used. 

Here three major colors Red, Blue and Green are divided in sub category like RGBG color. This is called as a 'pentile display'. But this have a disadvantage also, they can represent lower resolution because of much larger and visible sub pixels. 

Now a days, Samsung is known for their Super AMOLED, HD Super EMOLED displays. But this is nothing but simple AMOLED which is used with just prefix 'super'. They are traditional EMOLED. So do not fooled by these type of names. 

These are the devices which uses AMOLED technology: HTC ONE S, Galaxy series by Samsung.

Conclusion:

Now let's come to the answer that which one is better? So my answer is both LCD and EMOLED have their own strength and weakness. So it is totally dependent on you which one is like by you personally. If you try and phone and you get good resolution, better color reproduction and good viewing angles, then definitely that display is good for you. 

Samsung Galaxy Gear Vs Sony Smart Watch 2

IFA 2013 which held in Berlin, Germany bring some exciting new electronic gadgets in our world. Most of the people are talking about new smart phones like Galaxy Note 3, Xperia Z1, Iphone 5S & iPhone 5C. But one another news was not much noticed that both Samsung & Sony launched wrist watch which is really exciting gadgets called Galaxy Gear & Smart Watch 2 respectively.

Design

First of all if you look at the basic dimensions and size, you will notice that Galaxy Gear is more rectangular, and Smart Watch 2 is square shaped gadget. Gear is weighted 74 gram and Smart Watch 2 is having 123 gram with a metal strip. Both gadgets are made from metals. Smart Watch 2 having an aluminium body whereas Gear have a stainless steel body.

Display & Processor

Both gadgets come with a 1.6 inch display. Gear having a 1.63'' inch  Super EMOLED display with a resolution of 320 x 320 pixels and 278 ppi density. Smart Watch 2 having 1.6 inch Transreflective display with 220 x 176 pixels and 176 ppi density. This means that Gear has much sharper and bright display very close to latest smartphones. 

I believe that processing power is not much important in these type of wrist watches. But if you are really looking for high power then Gear have 800 MHz Samsung Exynos processor while Smart Watch 2 have ARM cortex M3 processor with 200 MHz.

Battery Life

This is the department in which Smart Watch 2 over shadows its rival by a huge margin & for wrist watches this is the key factor. Gear having 25 hour plus batter life which is really bad for a gadget like this. Wheres Smart Watch 2 having 3-4 days of batter life as per company said. Thanks to its just 200 Mhz processor and display which improves its battery performance. So if batter life matters for you then you definitely have to go for Smart Watch 2.

Other Aspects

Gear having a facility to answer your phone call. Which is not available in Smart Watch 2. But one horror fact is that it is just compatible with Galaxy Note 3, which is not released in all the markets yet. On other side Smart Watch 2 is compatible with all Android powered smart phones and provide notification related your phone. Both gadgets are not compatible with any of the iPhone.

Gear have a 1.9 MP camera which is fitted on its wrist band whereas Smart Watch does not feature any camera. 

Smart Watch 2 is NFC facilitate & Gear does not have this facility. 

Price & Release Date

Both gadgets are plan to release in closing of September this year. 

Gear will be available at $299 in USA market & INR 21,000 in Indian market.

Smart Watch 2 will be available at INR 14,000 in Indian market & I am not sure about USA market but it will be available at around $220 as per my views. 

iPhone 5S & iPhone 5C : First Look

Its almost after one year when Apple released iPhone5 last year. There was too much curiosity in the market related to upcoming iPhone. The rumor was also there that Apple will launch two iPhone. Now its exactly same and all prediction become right. So, I will not get too much time and start our review. First of all we will talk about iPhone 5S. Because it is their flagship phone and having latest hardware. 

iPhone 5S

New iPhone 5S is the successor of iPhone 5. It has first ever in the world 64 bit processor. No other phone have 64 bit processor till date. 

• A7 Chip: It is 64 bit chip which is Apple's proprietary processor made specially for iPhone. This chip gives double performance then the previous A6 chip in CPU and GPU related tasks. There is another best combination with iOS7, because they specially made it for 64 bit chip.

• M7 co-processor: This new combination included in this iPhone 5S is like a master-slave combination. Because M7 co-processor works for some miscellaneous tasks like compass, accelerometer, gyroscope tasks. So all this will be done in M7 co-processor and it will directly reduce the burden from the A7 chip. Another huge pro is that, it will increase battery life.

• Camera:  There is no doubt that iPhone will have a great camera. Yes, again its much better improved then previous one. The iSight camera comes with 8 MP auto focus camera. It is basically a five element lens which have hybrid IR filter. The camera provides features like auto focus, tap focus, face detection, burst mode, panorama.,etc. 

• Display: This phone have 4 inch retina display having 1136 x 640 pixels resolution. It provides density of 336 ppi. One huge feature added in this display is this iPhone 5S can support 'finger print' scanning! So you can lock-unlock and even use finger print as password for phone and app store. 

After discussing these key features I must say that they did not invent or bring any hurricane in specification of this new phone. But as per company's brand value, iPhone 5S will also bring big success for Apple. iPhone 5S come with grey, gold and silver of bezel aluminium case. 

iPhone 5C

People were talking about that this time apple is going to unveil another 'cheap' iPhone for some economical users. So that's here. Again with this phone I am not that much impressed. Because the main aim of this phone was to gain good market share in Asian countries like China,India. So they have to keep the price of this phone as low as possible. But that does not practically happening. 

The configuration of this phone is same as one year before iPhone5. To reduce its price they put a poly carbonate cover like Samsung for this iPhone 5C. This phone comes in colors like green, yellow, blue, pink and white color. So this is its biggest plus point. Otherwise same hardware like iPhone5. So I do not want to discuss about it more. Just enjoy its colorful back cover pictures. One thing i noted in this phone is they made its edged with much sharp curve. So it looks really cool. 

Sony Xperia Z1

Last year when Sony released their flagship phone Xperia Z, it created a new path which have the waterproof feature and stunning looks. After almost one year there were rumors related to the new phone's name in the market. The phone would be named 'Honami' , 'i10' and 'Z1'. Now Sony has officially reveled the phone with name Xperia Z1 in IFA Berlin 2013.

Previously I had written an article with leaked pictures of this phone. The phone looks exactly same. I am writing the key features in points so every one can easily understand them.

• A groundbreaking camera with Sony's award winning G-lens. It is 20.7 MP camera with EXMOR RS sensor,CMOS image sensor and BIONZ mobile technology.
• Reinvented camera application which is very well synchronized with social networks. So you can share pictures and videos live.
• The technology which is used in Sony's BRAVIA televisions. It is used here called as TRILUMINUS display.
• Like other Xperia devices this phone is also dust and water resistant.

after all these heavy features we are comparing this phone on different basis.

Camera:

There is no doubt that this phone is world's best camera phone, and it even beats Nokia's 41MP phone. As I said before that in this phone Sony has included their technology used in digital cameras. So in one word I can say about camera performance is just 'awesome'.

Screen:

This phone comes with a 5.00 inch display which is same as previous Xperia Z. The new thing is that they had included new BRAVIA technology. 

Looks:

According to me, this phone is best looking phone even surpassing the Xperia Z. There are minimal physical buttons and the buildup is thin and elegant. Thanks to aluminium bazel which gives this phone a super premium finish.

Final verdict:

The exclusive Xperia Z1 in undoubtably one of the most advance and best phone. Even if you compare it with Samsung Galaxy S4, HTC One and Lumia 1020. If Sony manages to sell it with some good marketing and price point then it have potential to get a grand success.

 

Specifications:

Display:               5.00 inch

Processor:           2.2 Ghz Quad Core

RAM:                   2 GB,upto 64 GB expandable

Internal storage:   16 GB

Camera:              20.7 MP rear camera, 2 MP front camera

Resolution:          1920 x 1080 pixels

OS:                          Android 4.2

Mobile Processors : Quad Core VS Dual Core

There was a time when everyone was fascinating about Mega Pixel of their phone camera, and after that era, Screen size of mobile phone came into the picture. The bigger size phones always fascinate people. But now the benchmark has changed, the number of cores attracts people, and it is the new benchmark for comparing mobile phone.

People are talking about single core,dual core,quad core processors. Now even some small companies even launching phones at budget prices having quad core processors. So in this article we are going to learn what is the exact meaning of multi-core architecture of any smart phone.

First of all the basic difference is just simple, a dual core processors can carry out the instruction sets by improved performance. Quad core processors also does the same work, and they are basically four cores which are integrated on a single silicon chip which gives us high performance.
In simple words,quad core processors can carry out same work done by dual core processor at a twice speed!

If you compare the processor with your brain then dual core processor have two brain and quad core have four brain. So, the time required to complete the task by quad core is almost fourth  of the single core. But its not as simple,actual performance depends on memory cache,bandwidth, core clocks,.etc. Thus variation will always be there.

Memory

Typically only a more powerful processor is not always important. Because processor takes help from ROM(read only memory) and RAM(random access memory).

For ROM,the operating system of any smartphone is stored on the ROM. These memory area can not be accessed by the user. If you want to access that area then you must root your smartphone. Mostly in Android phones these situation occurs when you have less internal space for installing big applications and games. The less amount of memory, your phone will become slow. 

Same situation comes in RAM 's case. Where, all the running applications are stores on RAM and that's why processor takes help from RAM. If you have a quad core phone then it maybe having 1-2 GB RAM or other dual core phone having 512 MB to 1 GB of RAM.

So,in conclusion, the amount of RAM is always as important as a processor and it makes big difference in performance. 

Snapdragon processor by Qualcomm

Result of performance

It depends on Architecture of the processor and clock speed. Most of mobile processor are based on ARM architecture. Upon these architecture several companies are licenced to make the type of processors. Few examples of these companies are Qualcomm , Nvidia, Samsung Exynos. They are having licence to produce it, and they make processors based on that. In latest technologies , they are said to be having A5,A6,A8,A15 architecture processors. So if the processor having quad cores but have older architecture then it will be not optimum in comparison with other processors. 

So always go for ARM  architecture of the processor and know about its clock speed.

Power consumption

We have heard that if you have more cored phone then you might be having less battery power to use. But it is not always true because latest Quad core processors come with advanced architecture which consumes less power and even in some conditions they beats the dual core processors. In normal conditions the mobile phone switch off the non used cores and they will be activated when they will actually needed. 

So, battery power depends on the amount of mAh of battery,not totally on processor.

nvidia tegra processor 

Final verdict

At the end of the day, all depends on the price of the phone and in that matter, quad core processors have complex architecture so they are costlier then dual cores. 

If you are going to buy a phone , try to figure out other features like clock speed, RAM, ARM architecture.  

"You can buy a smartphone having Quad core processor at the price of 15000 INR. And even a dual core phone at 18000 INR. So there would be some concrete difference between them"