Yeah definitely try restarting the router first, I have had this before, and my mate too. Strangely was with a homehub both times.

had a similar problem on my HTC. Reset the Internet at the person's house I was having trouble connecting to and issue solved

Bit of an odd one here guys, got an Iphone 3gs, just recently i've noticed a problem with the wifi connection icon. I've got my phone set to auto connect to two known networks, my house & my girlfriends house. At mine, the phone is fine, connects and displays the wifi signal strength icon. However, at my girlfriends, I get no signal icon but when i go to settings it syas i'm connected to it. When i use an app, e.g facebook, i get the 3G icon to show its using that but the settings show i'm connected to her wireless? I've tried forgetting the network and re-joining but it doesn't change. Any ideas??