HELP! Doesn't see wi-fi after an insertion 4.1

Forgive for my English!
Has stitched the iphone 3g, with an insertion 3.1.x on an insertion 4.1, iTunes 10, has ceased to work WI-FI, at all doesn't see networks, to an insertion worked!
Became periodically will be switched off!!!!!!!! I will repeat to an insertion iPhone 3g worked perfectly!!!!
How to return an insertion 3.1. Х?
In what there can be a reason?
How I can correct it?
I start to trust hearings which go on the Internet that it is made specially that would buy iPhone 4g

If no change after resetting network settings on your iPhone at Settings > General > Reset and selecting Reset Network Settings which will erase all wi-fi networks from your iPhone that your iPhone has previously connected with and will require re-joining each wi-fi network you have access to, try restoring the iPhone with iTunes as a new iPhone or not from your iPhone's backup.
If no change after these steps, your iPhone has a hardware problem likely with the wireless card.

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