If I was to buy a iphone 6 plus from best buy but it's a sprint device can I change the device over to boost mobile to make it

[Cekeya]

If I was to buy a iphone 6 plus from best buy but it's a sprint device can I change the device over to boost mobile to make it prepaid

 

[hang-the-9]

The phone you are having would need to be unlocked to move to a different carrier. So when you get the Sprint phone, you need to contact Sprint and have them unlock the device, then contact Boost Mobile and check if they can activate it. Or check with Boost first to see if it can be used, the 6 is listed as usable here https/www.boostmobile.com/support/faq/phones-devices/activate-a-sprint-phone/