Navigate your way to Settings > Connections > Mobile Networks > Network Operators.
If a network, like “Verizon” or “T-Mobile” appears under Network Operators, your phone may be unlocked.
While these methods are simple, they may not provide ironclad proof. For further confirmation, switch your SIM card out for another carrier’s SIM card. Make a phone call — if it connects, your phone is indeed unlocked.
When in doubt, contact your service provider. They are legally required to provide this information in a timely manner (within two business days).