"iPhone 4 is the biggest leap since the original iPhone," said Apple CEO, Steve Jobs, while unveiling the fourth-genration iPhone at WWDC. Rogers Unlock code by IMEI. Apple's iPhone has achieved a phenomenal success world-wide, evolving into the most advanced  mobile phone in its successive generations. A year ago, Apple launched its iPhone 3GS model featuring a camera with higher resolution and video capability, voice control, and support for 7.2 Mbps HSDPA. The successor iPhone 4, turns the dream of video calling into reality. Apple’s innovative new Retina display and the highest resolution display ever built into a phone, ensures crisp text, images and video. Additionally, iPhone 4 features a 5 megapixel camera with LED flash, HD video recording and a 3-axis gyro and up to 40 percent longer talk time. All this comes in an scintillating all-new design of glass and stainless steel encasing the slimmest smartphone on this planet. The fourth-generation of iPhone comes with world’s most advanced mobile operating system - iOS 4,  which includes over 100 new features and 1500 new APIs for developers. Before you bet your money to go for superior iPhone 4, you need to have a look at the top advantages it offers over iPhone 3GS. We draw the top 10 iPhone 4 Vs iPhone 3GS comparision of features.

1. Display

iPhone 4 retains the size of 3GS with a 3.5 inch diagonal. It's completely different with 4 times as many pixels with the so-called retina display.  Not just that iPhone 4 flaunts a 4 times the pixels of earlier iPhones, you can feel the difference between the glass you touch and the pixels that are removed.

The 3GS offers a 480×320 pixel resolution at 163ppi. While the iPhone 4 receives a significant bump up providing 960 x 640-pixel resolution at 326ppi and an 800:1 contrast ratio. The screen isn't OLED as with some other smartphones. While the screen isn't OLED as with some other smartphones. Apple claims its IPS display technology is better.

2. Storage

The iPhone 4 is available at capacities of 16 GB and 32 GB. The iPhone 3GS has regressed with a new 8GB of memory model apart from the 16GB and 32 GB models. This looks a bid to woo the customers on budget looking for the defunct iPhone 3G.

3. Camera

iPhone 4's camera is a much-hyped issue, especially with the HD video recording facility.  But, it won't match the best camera phones. Still its excels the 3 megapixels iPhone 3GS with 5 megapixels camera and an added LED flash. What's more, you have a front-facing camera for FaceTime Wi-Fi video calls and more.

4. HD Video recording

With a Flip Mino HD like video quality iPhone 4 is a giant leap in terms of video recording. The 3GS also supported video recording but it was VGA. iPhone 4 received a 720P is a real bump up to a 5 megapixel camera with a nice addition although at this size any further megapixel increases do become a bit silly due to lens size.

5. Wireless and data

iPhone 4 goes a step ahead of 3GS to adds 802.11n along with 802.11b/g and Bluetooth 2.1. The 7.2Mbps HSDPA, 3G and EDGE specs continue to feature in the iPhone 4.

6. Sleek design

As Steve Jobs' claims, Apple iPhone 4 is the sleekest mobile on earth. Just 9.3mm in thickness, 24% thinner than the iPhone 3GS, the Jony Ive (iPhone 4).  iPhone 4 measures 0.37 inch deep whereas iPhone 3GS's thickness stands at 0.48 inch. Further, iPhone 4 is slightly narrower, 2.31 inches to 2.44 inches. The two models weigh the same 4.8 ounces, still the tweaks to the dimensions make the iPhone 3GS seem more sludgy in comparison to the newest iPhone.

7. 3 axis Gyro

The most advanced feature added to iPhone 4 is the 3-axis gyro that takes motion-sensing in mobiles to a new level. When paired with the accelerometer, iPhone 4 can perform advanced motion sensing such as user acceleration, angular velocity and rotation rate. With the inclusion of gyro, iPhone 4 will offer motion gestures and greater precision to elevate the gaming experience.

8. External buttons and inputs

Overall iPhone 4 inherits the same form factor and buttons, but it adds an extra mic button to offer better call quality through noise cancellation.  Evidently there has been no alterations in the button sizes or location, but the volume of button has been separated into up and down.

9. Power and battery

According to Apple CEO iPhone 4 offers a 40% improvements in its battery performance over the 3GS model. With a 7 hours talk time on 3G, iPhone 4 exceeds 5 hours on the 3GS. The standby time nears 300 hours, which is same for the 3GS.

Users can expect an hour more on browsing and 10 hours more audio playback with the video unchanged at 10 hours.

10. iOS 4 and multitasking

One of the greatest advantages with iPhone 4 is the iOS 4 operating system that supports multitasking, details of which you can read in our article. The iOS 4 includes over 100 new features and 1500 new APIs for developers. What's more, iPhone 4 with iOS 4 will ensure that multitasking doesn't hamper the performance or battery life. Steve Jobs demonstrated that the services such as Pandora and navigation running in background while other apps were running in the foreground.

Those using Apple iPhone 3GS can go for an upgraded to iOS 4 as soon to be available on in iTunes 9.2 for Mac OS X and Windows in a while or June 21st. Alternately users can go for a iPhone 3GS 4.0 jailbreak.

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