The differences between 4G iPhone and 3Gs iPhone are:
4G iPhone
Resolutions : 640 x 960
Cellular : Quadband GSM, pentaband HSPA
Wi fi : 802.11/g/n
Dimension : Slightly smaller than 3Gs (114.3x58.7x9.4mm)
Capacity : 16 or 32GB
Video : H.264 up to 720p @ 30fps (framerate per second)
Sim size : Micro SIM
Weight : 137g
Battery life : up to 7 hours talktime on 3G
up to 14 hours talktime on 2G
up to 10 hours data on Wifi
up to 40 hours audio
up to 10 hours video
3Gs iPhone
Resolutions : 320x480 resolutions
Camera : 3 megapixels camera auto focus
Cellular : Quadband GSM, triband HSPA
Wi fi : 802.11/g
Dimension : 115.5x62.1x12.3
Capacity : 8GB
Video : VGA @ 30fps
Sim size : Normal SIM
Weight : 135g
Battery life : up to 5 hours talk time on 3G/data
up to 12 hours talk time on 2G
up to 9 hours data on Wifi
up to 30 hours audio
up to 10 hours video
So,above are some of the basic ideas which one you will choose for.Of course,I will go for iphone 4G as it is slightly smaller and have more functionalities than 3Gs iphone..^^.Thumbs up for 4G iPhone~
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