I gave a friend a new SIM card for her unlocked direct from Apple iPhone 5.

She put the SIM in, and went through the setup process, restoring her iPhone 5 from an iCloud backup. At this point, her old phone lost all signal and refuses to connect to any carrier.

She did not go through any activation process specifically as you would on a new phone, but I *think* that what has happened is that the activation has occurred as part of the restore process, and that this has somehow deactivated her previous phone.

Can anyone clear up what the activation process does, if it can be done automatically as part of a restore, and if this *is* what happened tell me how I can re-activate her old phone without a factory reset?