Wifi  does not detect networks

Hi,
I have an Iphone and the wifi works fine but i got a second one for my sister and with 5-6 networks in my building it cannot detect them . the "thinking circle" spins and spins and nothing .
I mentioned i have an iphone to let you know that i know how to use it and i have a wireless network set up in my apt plus other 4 of my neighbors .
maybe some of you experienced the same thing . i ran out of options ...is it a hardware problem ?
PS i just upgraded both phones to 2.0
thank you much

Try a fresh restore on the phone (do not install a backup) and see if this solves the problem.
Turn off your phone.
Restart your router (i.e. turn it off at the mains for 30sec the on).
Try accessing the network on your sisters phone only.
Failing that book into a Genius Bar at your local Apple store as this is potentially a hardware issue, due to the fact you have a phone that works fine.

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