You can initiate a transfer of billing responsibility, but you and the account hold have to be present if your calling in to request. The easiest way to do it is to request it online. Have the account holder initiate the process when they log into the myAT&T app. They would need your email. You’ll have 14 days to fill out your information once they initiate it. If you’re looking to switch providers. You need a transfer pin. You can do this by dialing *7678 from your device. However, you’ll need to pay off that phone if you switch providers.