Originally Posted by
linglingfool
T-Mobile has instructions
here on how to set an APN.
From doing a bit of reading, though, it appears that lots of carriers send their settings to be included in iOS by default, which is probably why they were already there when I set it up on that iPhone. Knowing that, I think you'll be fine.
That's nice to hear. I was in China recently and got a local SIM for an iPhone 5. I didn't have to change APN for it to work. I think you are right about iOS.
Thanks again for your help.