Open the Settings app
Tap About phone or About device
Look for Phone number or SIM status
Open the Phone app
Tap the three-dot menu or Settings
Check My phone number or SIM card status
Open Contacts
Tap your profile or Me
Check your own contact card
Go to Messages
Open a conversation and check your sender details if available
Check the SIM card packaging or carrier account
Call or text another phone to see the number displayed
Contact your mobile carrier if the number is not shown