Whenever I pass through the UK and try to use my Desire I get the "your Sim card does not allow a connection to this network" message. This only seems to happen in the UK, I have had no problem connecting/roaming in South Africa, Brazil, Malaysia,Singapore,Australia. I tried UK payasyougo Sims and they would not connect either, but worked fine in my old Motorola. I bought the Desire here in Thailand from a HTC shop, It has a T-Moblie splashscreen when starting up. I have tried lots of suggestions without any luck, (ie turning off radio/removing battery, factory reset.