so I've been in to the Apple store several times looking for a silver SE in 64g. Today they finally had one but it's an AT&T model. Now does this mean that it just comes with an att sim? Or will some of the bands be different? They are both GSM but I'm worried about the infamous band 12 lte or any others being absent for Tmobile. Can anyone please clarity for me? I'd really appreciate it as I when ahead and purchased the att model but obviously I can return if need be. Thanks very much!