How do I unlock a Boost phone to use on another carrier?

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How do I unlock a Boost phone to use on another carrier?

My mom brought my sisters and I's iPhone 6s from Sprint and is now activated with Boost Mobile and have been with you guys for about 2 years. So I am looking to buy an unlocked iPhone X A1865 (I think which is compatible with Boost Mobile carrier) and wondering if can I put my current SIM card which is currently activated with Boost Mobile into the unlocked iPhone X?

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Hey there, briannaleighs! The iPhone X requires a special SIM card. Please call 888-266-7848 to get the phone’s compatible SIM card.