What providers can I use my iPhone 4s with?

I have an iPhone 4s currently connected with Sprint. To my understandings the iPhone 4s is CDMA and GSM compatible. So if I were to terminate my contract with Sprint would it be possible for me to use my phone with other providers such as Boost Mobile, NET10 and Straight Talk?

Nope.heres why.sprint doesn't use sim card and the ones that you listed do. The only other service that i can think of that doesn't use sim card like sprint is cricket but cricket has a strict policy. They don't flash apple phones because they have their own apple phones to sell.