How to activate Iphone 6 with clean ESN and SIM Card not included?

So I recently bought an Iphone 6 from Sprint on ebay wihout a sim card included. I tried putting in my now old iphone 5s Boost Mobile SIM Card but it kept saying invalid SIM and something about it being blocked. Do I need to buy a new SIM Card?

Firstly, the Boost SIM will not work on Sprint as you need to flash the phone over to Boost. If you want to use the phone on other carrier, you've to unlock the phone. If you need more info about getting your phone flashed or unlocked, mail me for more info.

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