I have switched from the S6 (AT&T G920A) to S7 Edge, but I would like to update the S6 to MM so that my wife can use it. It is currently on 5.1.1 but I do not have a SIM for it. The SIM card from wife's current phone will not work in the S6. Do I need to get a new SIM from AT&T to update the S6?
Thanks in advance for any help.
Thanks in advance for any help.