I have the latest update 2.1, but I have a very worrying problem. After a couple of days the phone is unable to make or receive calls, or send or receive txt messages. If I try and make a call it attempts to start the call, but immediately comes back with unavailable. Incoming calls go straight to voicemail. Outgoing txt messages don't work. What is strange is that if I try and browse the web (over 3G) then that works fine! I have tried doing a network scan again, and reregistering to Tmobile, but that doesn't make a difference. If I turn the phone off and on again, then it is fine and all calls/txts are working again. I have seen this 4 times now with my phone. It doesn't always happen, but it has happened a few times now which is worrying. The annoying thing is that you obviously don't know when incoming calls stop. You only find out the problem has occured when you attempt to make a call or send a TXT. I am on tmobile in the UK. Anyone else seen this or have any suggestions?