So I got my iphone 4 unlocked from AT&T and am using it on T-Mobile. I do not have a data plan and have been trying to figure out this iMessage and Facetime thing. I got iMessage activated and working last week. Used it with my brother and sister several time (one on AT&T the other on Sprint). Later called T-Mobile as I was having issues with receiving picture texts, which I have since fixed, and found out I was being charged for international texts each time I sent an iMessage. T-Mobile waive the $1.80 I racked up but I'm confused why other say they only got charged once for the activation but I get repeatedly charged. Any ideas?