Hello all, I am traveling back to the US again with a factory unlocked iPhone 4S. I usually stop by the local T-Mobile when I get into town and purchase a one month unlimited SIM card for 50 bucks which has data, phone, and text. The problem is that T-Mobile coverage in the areas I travel to while it town are terrible. About 12 months ago when I was looking into this for the first time, T-Mobile was the only option. I was just curious if anyone else has stepped up and started offering pre-paid SIM's that will work in an iPhone? ATT? Sprint? Anyone? Thanks for any replies.