IPhone wifi-network problem- Please Help!

I have a problem with my iPhone4. It could only connect to the internet for a couple of minute then it dropped off. But it is still connect to the wifi though and in my Mac the wifi seem to be working fine. Any ideas?

first start here
http://www.apple.com/support/iphone/wifi/
If that doesn't help then
Restore as new, if wifi  works add your backup and proceed .If after backup issue returns
Then you have a corrupt backup
If when restored as new no wifi then you probably have hardware issue and should take it to an Apple Store genius bar

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