TS2755 AT&T iPhone 5 to T-Mobile Samsung G3 MMS not working.

We can both receive and send picture messages from most everyone else, but not to each other.
We both have current software, have restarted our devices, etc. this has been happening for a month, and seemed to have begun since I switched from the iPhone 4 to my new 5.
Again, picture messaging works from me to anyone else I have tried - even people off AT&T and people without iPhones.
I am not sure who else I know is on tmobile or who else I know has an SG3.

No. Restoring it from your backup won't overwrite anything carrier specific.
I had AT&T; great coverage inside and outside of my office building.  I do have good coverage at home.
I unlocked (not jailbroke) my phone and switched to T-Mobile.  Now I get No Service even in my parking lot at work.  T-Mobile shows the area as excellent and being within a mile of 3 different towers.
Did you try putting an AT&T SIM back in it and see what your coverage is like?  Your experience pretty much jives with my personal experience of T-Mobile, which is, their service and coverage are lousy... And that's being generous.

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