iphone can't connect to wifi
Hi, i'm using an iPhone4 (4.3.1) and it was everything fine till yesterday.
This morning I woke up and i saw that the iPhone was working only in 3G so I tried to connect to the wifi network (I've got an airport extreme) manually but it said "unable to connect to wifi network XXX" altough I can see the networks in the wifi menu pannel.
So I turn off the iPhone in order to restart it, or smth else, but it was all the same... Then I have removed the wpa/wpa2 password from the network but the problem already exist.
I tried to create a new wifi network from my macbook pro, but the iPhone can't connect to it... I hope that it's not an hardware problem, and it'll be strange since i can see the networks around me but i can't connect to them: i think that if it would be an hardware problem, i couldn't see them.
Could you help me, please?!? I don't know what could I do now... The last chance is to contact the applecare..............
Thank you
Gian
iPhone 4, iOS 4.3.1