Check the carrier settings in the phone’s settings menu
Insert a SIM card from a different carrier
Make a test call or use mobile data with the other carrier’s SIM
Look for an “Unlocked” status in the phone’s device information
Contact the original carrier and ask if the phone is unlocked
Use the carrier’s IMEI check tool or an online IMEI checker
Review the phone’s purchase receipt or account details for unlock status
Try activating the phone on another carrier’s network
Check whether the phone accepts eSIM or physical SIMs from multiple carriers
Confirm the phone is not tied to a carrier-specific boot screen or branding