I doubt it.
If so, AT&T would spend countless hours assisting all their customers to change the APN settings.
Besides that, the network panel is not even open when using an AT&T sim in an AT&T locked iPhone.
I doubt it.
If so, AT&T would spend countless hours assisting all their customers to change the APN settings.
Besides that, the network panel is not even open when using an AT&T sim in an AT&T locked iPhone.