Check the SIM card packaging or carrier documents
Dial your carrier’s self-service number or USSD code
Call or text another phone and read the caller ID
Check the phone’s Settings under About Phone or SIM status
Open the Contacts app and look for “My Number”
Use your carrier’s mobile app or online account
Contact your mobile network provider’s customer support
Insert the SIM into a phone and check the phone number settings
Ask the carrier store to look it up using the SIM details
Check old messages, contacts, or account records linked to the SIM