I have the internet at home hooked up to a wireless router. My phone has no problem switching between wifi and 3G as I come and go to and from the house. The problem is that Comcast sucks and my internet connection is constantly dropping throughout the day. The wifi signal is still good (the router isn't what's failing, it's the cable modem), but there's no internet connection. The phone stays connected to the wifi, but I have no internet access. Is there a way to make the phone recognize when the internet is not accessible and to switch to 3G (and then switch back to wifi when the cable modem resumes working)?