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Hi, MzSolomon! Thanks for contacting us. In order to assist you better. Can you please let us know what's the phone original carrier? Can you please let us know the make and model of the phone that had the SIM card you want to use?
Understood. It's possible that the SIM card is not compatible with your iPhone SE. To verify your device compatibility and purchase a compatible Boost Mobile SIM card, please visit our website https://activate.boostmobile.com/bring-your-phone?intnav=TopNav:Phones:BringYourPhone or visit your nearest Boost Mobile store.