Also just chatted with Apple in the online store.
They told me this (for both t-mobile store and apple store):
and asking for when if apple will offer unlocked for launch day:
They also gave me the usual snipped about t-mobile internationally:
And they confirmed again that this means that I can't put a US AT&T sim in that phone
They told me this (for both t-mobile store and apple store):
If you want to use it in the US with a different carrier, I do recommend reaching out to TMobile directly to see how long you need to use their service before they unlock - I have heard from customers that Tmobile says 90 days, but definitely call to confirm
and asking for when if apple will offer unlocked for launch day:
Currently, we don't have any information on that. In the past, there has been an unlocked model available a month or two later.
They also gave me the usual snipped about t-mobile internationally:
Okay, awesome. So the iPhone Contract Free model for T Mobile is able to be used on T Mobile here in the US, but is able to be used internationally automatically by just taking out the nano-SIM and replacing it with one from the GSM carrier you're wanting to use, worldwide!
And they confirmed again that this means that I can't put a US AT&T sim in that phone