Will I be able to unlock my iPhone if I don't know the original carrier?

Recently my old iPhone broke (water damage) in which my mother gave me her new but un used iPhone 5, I know it's locked to a different network. But I don't know which network, if I went to a shop to get it unlocked, would they be able to if I didn't know the original sim carrier?

Um… Why not just ask your mom?

Don't

No

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