Contact your mobile network provider immediately
Request SIM block or SIM deactivation
Verify your identity with the provider
Ask them to suspend the number if the phone is lost or stolen
Request a SIM replacement if needed
Use the provider’s app, website, or customer support if available
Remove the SIM from the device if you still have it
Report the loss or theft to the police if required by your provider
Change passwords for accounts linked to the phone number
Enable a new SIM PIN on the replacement SIM