Open your phone’s Settings and look for SIM status, About phone, or About device
Check the Contacts app for a saved SIM contact or your own number
Dial your carrier’s USSD code to display your number
Call or text another phone and check the caller ID
Send a text or make a call to a friend and ask them to read the number
Check your carrier’s mobile app or account portal
Look at the SIM card packaging or activation documents
Contact your mobile carrier’s customer support
Remove the SIM card and check any printed number on the card or packaging
Use a phone number lookup feature in your device settings if available