There is no discernible pattern to the disconnections/non-connections. I have tried three different SIM card and all have worked OK for a period, sometimes for a week without disconnecting. But yesterday was a disaster and the final straw. I could not get a reliable connection at all. After a reboot, sometimes it would connect, albeit for a few minutes, but most the time it wouldn't. Now why it says that 'SIM card not found' when it was previously connected and the card was not touched, is beyond me. As for contacting local technical support, how do I do that?