Open your phone’s Settings
Go to About phone or About device
Look for SIM status or SIM card status
Check for ICCID or SIM number
Remove the SIM card and read the printed number on the card
Check the SIM card tray or SIM packaging for the number
Use your carrier’s app or website
Dial your carrier’s customer service number
Send a text or call another phone and check the caller ID if needed
Use a USSD code from your carrier if available