On BestBuy the unlocked s10 description says it would work with all carriers and boost mobile is on that list of carriers so yes it is compatible but i dont know if boost mobile themselves would activate it.
Hi there! Thanks for your inquiry. You need to order a compatible SIM card. Please follow this link to do so: https://activate.boostmobile.com/bring-your-phone. Besides this, do you have any other question or concern?