Can I use my sprint iPhone 4 with Verizon or TMobile if I get it unlocked?

Can I use my sprint iPhone 4 with Verizon or TMobile if I get it unlocked? - 1

A sprint iPhone 4 is cdma only so you can't use it on t-mobile.

I'm pretty sure you can't use any Sprint phone with any other carrier because some how they lock there phones so you can only use Sprint at least that's what I've heard a lot of people tell me.