I have had periods of 3 hours where my phone suddenly has no signal! its very weird! once at work where signal is low and once at home where signal is ok! not sure if its a loose connection or just the phone having a moment!

In my experience nothing brings it back! it just comes back on its own! tried turning off and on, tried pulling the sim etc!

its ok at the moment but not impressed! my N900 never did this! but in all fairness Iam on Voda! and they are pretty useless!