I restored from backup on a new iPhone 6 and it said No Service so I took the SIM out of the old AT&T one and put it in the new phone, works great, but then I got a text from AT&T saying something like "Your new phone requires a new SIM for use all features, please visit an AT&T store."
I'm guessing there's no need for that, just use the old SIM? Seems to be working fine.
I'm guessing there's no need for that, just use the old SIM? Seems to be working fine.