Any help much appreciated on this please!To cut a very long story reasonably short!......I'm on my third HTC ONE phone in a month. The first two were the ONE X - the first one I got had scratches on the back so I phoned immediately to ask for a replacement....never set it up at all. The second phone arrived a week later & all was fine except I couldn't make or receive calls (except occasionally) - it had 'Emergency calls only - no signal' coming up. Phones4U suggested trying a new sim which I got from Vodafone but the same thing happened. By this time I was reluctant to get another ONE X, so asked for a ONE S which arrived today. I love it size wise.....think it's much better than the X, but the same thing is happening! I was initially able to make & receive a call, but now intermittently it comes up with 'Emergency calls only - no signal' again. I've had the Desire & Desire S through T-Mobile over the last two years & never had any problems like that. Before I get back to Phones4U can anyone give me any idea what it may be/what I've not set up correctly?