Should I buy a iphone 4G or iphone 4S?

i want buy iphone. cannot decide 1 should order? iphone 4g or 4s? better? , difference?

 

wirelessly posted (mozilla/5.0 (iphone; cpu iphone os 5_0_1 mac os x) applewebkit/534.46 (khtml, gecko) version/5.1 mobile/9a405 safari/7534.48.3)

there no 4g yet. , no rumors either

 

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