on the subject of receiving calls on any tmobile phone. My Mum has a T Mobile Phone and I was in the kitchen just 15 minutes ago when her phone rung, it came up as 'Private Number calling' - Obviously I didnt answer it and simply turned the phone off but my Auntie has had this problem before whereas she received mobile calls at 5.30 in the morning and she was silly enough to answer it (so they called every night after the first call) and she said that she could her sort of pub background noise.
But anyway, can you get 'cold calls' on a mobile and do they scam you into wasting your credit if you answer?