Insert a SIM card from a different carrier
Check whether the phone connects to the new carrier’s network
Go to the phone’s settings and look for carrier lock or network lock status
Contact your current carrier and ask if the device is unlocked
Use the phone’s IMEI number on your carrier’s unlock status checker
Try making a call or using mobile data with another carrier’s SIM
Check if the phone accepts eSIM activation from another carrier
Look for a “No SIM restrictions” message on iPhone
Check Android network or SIM settings for unlock status
Review the original purchase or account details for unlock confirmation