I've occasionally suffered from the issue whereby the Desire drops the network signal and never recovers from it unless you either turn airplane mode on and off (which sometimes works) or power the phone down completely for a few minutes, which has always worked so far. However, I've had the problem 3 times already today coupled with the message "No SIM Card in Phone" ...... The only way around this is to power down the phone for at least 5 mins and restart. Anyone have any ideas re this ? Is it a phone, network or even a sim card issue? Can live with it if it happens once a week or so, but multiple times a day is a real pain!!