Insert a SIM card from a different carrier
Check whether the phone connects to calls, texts, and mobile data
Look for a carrier lock message during setup or after inserting the SIM
Review the phone’s settings for carrier lock or network lock status
Contact your current carrier and ask if the phone is unlocked
Use the phone’s IMEI on the carrier’s unlock status checker
Try making a call or using data without Wi-Fi on the new SIM
If the phone works with multiple carriers, it is likely unlocked