Switching is simple! Bring your unlocked phone to Boost Mobile and set yourself free with one of our unlimited plans. Prior to purchase check your phone compatibility at boostmobile.com/BYOP. Limited to 2 phones per customer. How it works Check Eligibility - See if your phone is compatible. Buy a SIM Card - Wait for your SIM card activation kit to arrive. Activate - Pick any Boost Mobile plan that's right for you and activate it online.