Got an HTC desire on o2 network. When I'm at work the connectivity of both phone signal & internet seems very flaky, dropping out several times during the day. Often takes a few attempts to connect with outgoing calls (even when the signal bars seem ok) and a few people have told me that they get error messages when trying to call me. I've called o2 and they say I'm in a high coverage area. They think it might be the sim or handset and yet I'm puzzled as to why these problems are worse at work. Any ideas?