Why can't my iphone 3g find any wi-fi networks?

My iphone 3g is not picking up any wi-fi networks but it's never done this before, i was wandering what happened, does anyone know?

This is simply because it is made by apple and apple are *** no other answer

IPhones are known to have their Wi-Fi chips designed to break after short periods (so you'll have to buy the 'new' one).

No apple is not sh*t, iPhone 3G has a problem with wi if, it can't be fixed, you should buy iPhone 3GS or above and the problem is fixed.

Don't know. If the Wi-Fi is on and other things pick up networks but your phone doesn't, then you have a problem

Try rebooting.