They could and it could be similar to emergency / fallback access in password managers. Send an SMS to the number (aka current SIM) before approving changes and force the person requesting the change to wait for X hours or days if there's no response to the SMS asking for authorization.
That's what the providers around me do, but I think it's because one of them got sued a while back and we only have about 3 providers pretending to be 10 different companies (aka fake competition).
That's what the providers around me do, but I think it's because one of them got sued a while back and we only have about 3 providers pretending to be 10 different companies (aka fake competition).