Ok, I am going to be jumping ship from sprint to AT&T when the GS3 launches. (tired of 100kbps data speeds). Since I will be buying three GS3's on contract I am thinking of going through amazon wireless. (no sales tax, usually a bit cheeper) But How does warrenty work? I plan on getting the at&t insurance for all three. Amazon handle it for first 30 days? then AT&T? Can I just take it to an AT&T store if it breaks since I have thier insurance? I've always bought my phones at company stores so I am not sure.