Can I use my sprint phone with another carrier if it isn't paid off?

I current have a iphone through sprint but the plan is pretty expensive. I'm thinking about switching to boost mobile. Can I use my sprint phone with boost mobile even though i haven't paid it off with sprint yet?

No. If you just try to change carriers without paying for the phone, Sprint will blacklist the device, and it won't work with any carrier. They would also not release the number for porting if that is also important to you.

  • Sprint iPhones flashed to another carrier? I have no idea where to begin. I HATE sprint. They are ridiculous expensive and the coverage sucks. I have an iphone 5, 4s, and 4. How do I go about flashing it to another carrier? Who do I contact?
  • If I buy an iphone used from another carrier ad buy a sim card from my carrier will that work? I have an iphone 4s with virgin mobile and I want an iphone 5 but all virgin mobile phones are so expensive! I looked on ebay for virgin mobile nano sim cards and they are only around 2 dollars. If I bought one of these sim cards and a used iphone 5 from another carrier would it work with my carrier?
  • How to switch at&t carrier on iphone 4 to sprint carrier? I have an iphone4 with at&t carrier and would like to connect it with Sprint if possible. My phone is jail broken and I unlocked it too but it still says at&t carrier on it and sprint won't connect it if its am at&t phone.
  • Do iPhones by Sprint work in Europe with another carrier s SIM card? I have an iPhone 4s and I'm currently under contract with Sprint which uses CDMA technology, but it also lets you use GSM in Europe. I'm aware about the fact that you can use it with a Sprint's SIM card over in Europe, but the roaming charges are outrageous. What i would like to do is, once my Sprint contract expires and i go to Europe, I wanna be able to use another carrier's SIM card. Is that even possible?