Open your phone’s Settings
Tap About phone or About device
Look for SIM status, SIM card status, or ICCID
Check the SIM card tray or SIM card holder for the printed number
Dial your carrier’s SIM info code if available
Use your carrier’s mobile app or website
Contact your mobile network provider
Check the SIM card packaging or original documents
On iPhone, go to Settings > General > About and find ICCID
On Android, go to Settings > About phone > Status or SIM status and find ICCID