Price- iPhone 4 with 16GB memory will be available for 9 and the 32GB memory turner will be available for 9.

Display screen- iPhone 4 will have a high resolution display screen with a retina display as its highlight. This phone has a 960*640 resolution display and has a 326ppi and a multi touch feature as well. iPhone 3G s had just a 480*320 resolution screen with a 163ppi and a multi touch feature.

Video calling- iPhone 4 has a face time feature with a ability for allowing its users adapt to video calling. The users can stay connected via video calling feature with just a tap of a button and this feature will make the users happy as they can watch their best pals on phone connecting across the globe. iPhone 4 has two cameras built in for frontal video chatting and also back view chatting. The Back next camera is equipped with an LED flash and offers focal length and also enriches the face time feature. IPhone 3Gs will users will miss all these jazzy features.

Camera- iPhone 4 has a 5 mega pixel camera and has a Led flash with a backside illumination sensor and an auto focus feature as well. The frontal camera on the iPhone 4 will be a VGA resolute camera with a tap to focus feature. IPhone 3G s is just having 3 mega pixel camera with an auto focus feature and has a tap to focus feature as well.

Video recording- iPhone 4 has a HD video recording and a tap to focus while recording a clipping. The Led light assists for better focus with excellent illumination. iPhone 3Gs has a VGA video recording feature as well as Tap to focus feature while recording a clipping.

Technically- iPhone 4 is technically enriched with a multi touch feature and an 802.11 b/g/n wi-fi feature as well. This phone supports 7.2 MBPS HSDPA network and also 5.8 MBPS HSUPA broadband services. GPS, accelerometer, three axis gyro, apple A4 processor, dual microphone noise suppression are additional benefits in it. iPhone 3G s is having features such as Multi Touch and also GPS and accelerometer features. This phone supports 802.11 b/g wi-fi network and a 7.2 MBPS HSDPA broadband connectivity.

Color- Both the phones i.e. iPhone 4 and iPhone 3G S are available in black and white colors. Note- white color of iPhone 3G s is not in production anymore.

Battery life- iPhone 4 offers a talk time of 7 hours on a 3G network and 14 hours on a 2G network. The standby time of iPhone 4 is 300 hours approximately. Its counterpart iPhone 3G s is having a standby time of 300 hours and is offered with a talk time of 5 hours on 3G and 12 hours on 2G. While using Internet, both phones deliver 6 hours talk time on 3G and 10 hours on wi-fi. The audio play back time is 35 hours in both phone and the video play back is 10 hours and is offered as standard.

Common features- iPhone 3G s and iPhone 4 has common features such as Multi-tasking, folder options, phone usage, iPod, safari browser, Mail, app store, iTunes store, messages, Maps and compass, voice control, search, accessibility, keyboard and ibooks.

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