From the Settings app, tap Connections.
Scroll to and tap More connection settings.
On this screen, you can review your device's status.
After you've reviewed your device's status, tap the Back icon to return to Connections.
Tap Mobile networks.
Tap Network operators.
Tap or slide the Select automatically switch to OFF.
If your device only shows one carrier, it’s likely your device is locked to that carrier. However, if you have multiple available networks, then your device is likely unlocked.
You've completed the steps!
