Iphone 4 is not connecting to wifi after upgrading it to 4.3.3  plz help

wifi is not connecting.it does connect in 15 meter range but as i leave the room it gets disconnected  is it a software issue or antenna issue plz help

Could be a couple of things. Check this support document about unable to see the iPhone in iTunes http://support.apple.com/kb/TS1538
If it is necessary to delete and reinstall iTunes, then you need to make sure that you do it exactly like the directions here http://support.apple.com/kb/HT1923

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