i dunno what is the problem is but my 7610 sometimes got coverage/reception and sometimes don't (0 bar)..mostly no coverage at all..but when i change to other phone, it works fine..that shows me my sim card is all good..this problem happen everytime and everyday..i switched off switched on..keep on rebooting..but there still no coverage..please do help me friends..thank you..
no coverage/reception
maybe u have a cover or case or something thats blocking the signals? otherwise i think there is a fault with the phone..
Sometimes non-original covers might be painted or otherwise created with materials that has an impact on the built-in antenna.
If the cover is original, and the SIM card works well in other phones in the same location (card is OK, phone bill has been paid, etc.) where the 7610 doesn't, it is probably best to send/take it to your nearest authorized Nokia service center.