Call AT&T customer service at 611 from your AT&T phone or 800-331-0500 from another phone
Use the myAT&T app or sign in to your AT&T account online
Go to the wireless account transfer or number transfer section
Request a Number Transfer PIN
If eligible, generate the PIN in the app or website
If needed, verify your identity with a text code, password, or account details
The transfer PIN is usually valid for a limited time
Keep your account active until the transfer is complete