How can I know iPhone SIM lock or unlocked?

Tap Settings > General > About > Carrier Lock

If you see SIM Locked, the phone is locked to your carrier.

nar208 Said:

"How can I know iPhone SIM lock or unlocked?: I want to know my phone sim lock or unlocked"

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Carrier Lock:

If you want a definite answer, as if it is or is not locked, then ask your Carrier. Visit a local store they have, or google their contact us info.