Will jailbreaking iPhone unlock it?

I have a black sprint iPhone 4S, and I have t-mobile. IPhone 4S's come with a sim card holder and tray too, but I have to go to sprint directly to unlock it for a high fee. I heard if I jailbreak it, it gets unlocked and I can use t-mobile with it! Is this true? Will jailbreak unlock an iPhone 4s to use any carrier, and if so how do I do it?!

Jailbreak WILL NOT unlock your phone! It will stay locked. How much is Sprint charging you?

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