I want to unlock sim

[Jigsawomaha]

In the root I found something about sprint and when I called boost they said someone paid the bill for my meidMy phones root says there's no carrier. I can't get msl,I have a sprint sim but it says not comparable. Boost says only theism that came with it will work but I have no way of getting

 

[dpham00]

Which phone do you have?