My phone does not see networks

[londo]

My phone suddenly lost its cellular connection. When I am looking for networks in manual mode the only network that the phone shows is 42503 and when I try to connect to it I just get "no service". I live in Israel and my network is Cellcom with Orange and Mirs GSM networks present. Other SIM card that I tried on this phone (Orange's) gives the same result. My SIM card works on other phone. Other wireless connections (WiFi and Bluetooth) work fine. Any ideas?

[swanem]

I contacted both my carrier and HTC, they both agree it's the mainboard that has gone bad.

[MikeChannon]

Have you tried taking the battery out for 10 minutes?
Have you tried a HARD reset?

Mike

[discodergenson]

on boot up, does the phone display the NO GSM or G NONE error? sounds like a corrupt radio. Check the forums for that... you will find a whole bunch-o-solutions. If it is hardware and you have warranty left, send it.