I upgraded my iphone 2g to 3.1.3 but ever since then my wi-fi doesn't work properly & oftentimes not at all. The wi-fi won't connect nor does the phone even locate wi-fi but I'm in my home trying to access my own wi-fi network. Please help? I reboot the iphone but then the phone doesn't have wi-fi capability. Then there are other times after I reboot the iphone I can see the wi-fi icon in the settings menu but the phone says "cannot search for wi-fi.