after years of being on the grandfathered unlimited plan from att, decided this year to finally leave att. I reserved my iPhone 7+ black 128gb through apple last nite, but when I was trying to checkout with the AUP, I couldn't select T-Mobile. I had to select att. Something about having to go in to a T-Mobile store to activate an AUP phone. Anyone in a similar situation? Just curious to see why this is the case? When I receive my now att activated phone, can I still take this phone to T-Mobile to make the switch? I'm certainly not locked in to att again, since the AUP phone I'm receiving is unlocked, and theoretically should be easily switched to the GSM T-Mobile network?