Boost will send you a trade-in kit. You must mail your old device back within 30 days of your new phone shipping.
Customers on the Infinite Access plan can trade in their previous device for an annual upgrade. Review: Is It Worth It? does boost buy back old phones
You can trade in your device either online or at a physical retail location: Boost will send you a trade-in kit
While convenient, Boost Mobile's trade-in offers are often lower than what you might get selling privately on sites like eBay or Facebook Marketplace. Review: Is It Worth It
Provide your current phone's IMEI and answer questions about its condition to get an estimated offer.
through its trade-in programs, allowing you to turn your device into account credit or use it toward exclusive deals on new phones. How to Trade In Your Phone
If a device arrives locked (e.g., "Find My iPhone" is still on) or in worse condition than described, your credit may be significantly reduced or canceled.