Can i unlock my iphone 4 sprint to another carrier?

This has been a question i've had since i brought it

The easiest and safest way to unlock your iPhone from Sprint is to get it properly factory unlocked by one of the big online vendors like http://www.cellfservices.com as a) it is legal, b) won't void your warranty and c) will last even if you upgrade iOS.
Jailbreaking on the other hand doesn't have those advantages and you are risking to permanently damage/brick your phone.

  • 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?
  • 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 unlock Sprint iPhone 4s to T- Mobile Carrier? Well, I have T-mobile without a data plan on my current phone. I recently bought an iPhone 4s from a friend who has Sprint. However, I have heard it is really hard to unlock it! I don't need to have a data plan on the unlocked phone, i just want to have call text and Wi-Fi. Also, I heard the sprint store might unlock it? I'm not very good with technology, so thank you for the help!