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My phone is locked to the carrier Digicel PNG. Help with unlocking it so I can use my Optus sim.
You would need to contact DIGICEL - Optus has no ability to unlock another carriers device.
Unfortuantely their webchat is down, and calling their helpline in PNG is out of the question, this leaves contacting them via facebook your ownly option.
May be easier and cheaper to just buy a unlocked/optus prepaid phoen here to use.