I live in Puerto Rico not in the states so this isn't a tmo issue it's more device related
Well I had a blue phone and also had issues with it on the t mobile network everything worked fine except data if I had less than three bars the internet pretty much was unusable it was an Blu energy which was an 4G only device. Just as you thought blu phone worked better on AT&T than on t mobile I was so eager to rid of it I brought an LG K7 no issues at all.
That's odd to me it seems something might be wrong with you IPhone had you tried putting the sim card on a other device and test it to see if you have the same issue because if its even freezing for which is rare with recently released IPhones then I say it's your iPhone that might have been given you issues
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