Contact your mobile network provider and report the IMEI number
File a police report with the IMEI number and proof of ownership
Ask the police or carrier to blacklist the IMEI
Use the phone’s built-in tracking service if it was previously enabled
Check your Google account with Find My Device for Android
Check your Apple ID with Find My iPhone for iPhone
Provide the IMEI number to authorities for investigation
Keep the original box, receipt, and device details ready
Change passwords for linked accounts immediately
Monitor your SIM card activity and request a SIM block if needed