WI-Fi just doesn't work ...

Hi.

I have a big problem with the Wi-Fi of my iPhone 3G. The thing is that it doesn't find any network (obviously there is one).

I tested it in my house and in other places also (where the Wi-Fi worked before), and still the iPhone doesn't find any network.

I restored the network settings, no favorable outcomes. Then I did a complete restore (the last resort)... same thing.

How could I fix this? I'm using 3.1 in this moment, but the problem started in 3.0.1 or 3.0, I can't remember exactly.

Thanks in advance.

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