Check your T-Mobile account online or in the T-Mobile app under account settings or profile security
Look for the account PIN, passcode, or security code section
Review any welcome email or account setup message from T-Mobile
Check your paper bill or account documents for a listed PIN or passcode
Call T-Mobile customer care and verify your identity to request the PIN or reset it
Visit a T-Mobile store with valid ID to get help with the PIN
If you forgot the PIN, use T-Mobile’s account recovery or PIN reset option
If you are the account holder, ask the primary account owner for the PIN
If you cannot find it, create a new PIN through your account security settings