Insert a SIM card from a different carrier and see if it connects to the network
Make a test call or use mobile data with the different carrier SIM
Check the phone settings for carrier lock or network lock status
Contact your current carrier and ask if the phone is unlocked
Use the phone’s IMEI number on the carrier’s or manufacturer’s unlock check tool
Restart the phone after inserting a different SIM and look for unlock or SIM not supported messages
Check whether the phone accepts eSIM activation from another carrier
Review the original purchase or account details for unlock confirmation