How to activate my sprint iPhone 4s for another carrier?

I had a plan with Sprint and I recently cut them off because it was too much for me, I have an iPhone 4S for sprint but I always wondering if I can activate it on another service? Is it possible? I wanted to activate it with Boost Mobile or with Straight Talk, that cheap prepaid stuff. I don't want to buy any prepaid cards and then not be able to activate it

Best to try and find out

or get the phone unlocked from the Sprint Network before activating any new sim

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