Has anyone with AT&T successfully transferred their sim from a 5 or 5s to iPhone 6? Did you have to do anything to enable the data network? I am handing down my 6plus to family with a 5s - all on the same account. After moving the sim, we can make calls but don't get a LTE data network. We verified that it is turned on. I tried resetting the network but maybe didn't restart the phone after. I'll try that again tonight. I read a post suggesting we need to call AT&T and have their internet settings changed on the line to NXTGENGPO. ....that involves calling AT&T and while phone is turned off, they add the setting. I won't be able to try again until tonight, so doing my homework first. Thanks for any insights!