I'm asking this question on behalf of my boyfriend. After 5 years with AT&T, he just unlocked his iPhone 4S and moved to T-Mobile. We're in the Kansas City area, and his coverage was pretty good for the first day or two. We drove to Chicago to visit his family, and on the way there his phone kept dropping to Edge or even lower throughout Iowa and even sometimes in Chicago. He also was on I Wireless for a while. According to T-Mobile's coverage maps, he should be getting 4G HSPA or 3G even along I-80. I'm on Verizon and have been getting LTE on my iPhone 5. I read something else on here about 4Ses on T-mobile having these issues. Anyone else experience this? He's only had the 4S since October, so he's thinking about keeping it for another few months and then getting the 5 or whatever comes later since coverage is pretty good at home.