It has been just over 30 days since I established new service with AT&T and purchased the iPhone 3GS. I also still have an active T-Mobile account and am now at a point where I need to decide which carrier to keep. With this post, I am interested in knowing what the thought process was for others in a situation similar to mine. What factors did you consider? What compromises did you make? Can you offer some feedback to help me make my decision? A few key points of consideration particular to my situation: Plan. T-Mobile has a great plan for me: essentially $85 unlimited everything plan (that "Unlimited Loyalty" Plan") Coverage. AT&T appears to have better reception (I get full bars most of the time, compared to the 1-3 on T-Mobile), but I have still experienced some dropped calls during the past 30 days WiFi. There is WiFi at home, work, and school the three places where I am the majority of the time so coverage is not always a major issue, I suppose Warranty. I am somewhat concerned about the "warranty" issue... what if for some reason the iPhone stops working? I bought AppleCare, but can I simply submit a "restored" phone that hasn't been activated in for service/repair? How does that work if I am told to take it in to a Genius Bar? Note, paying the EFT to either carrier is NOT a concern for me. The iPhone itself was a gift, and, therefore, I do not mind paying the EFT as part of "my share" of the deal. Thank you!