Unlocking Galaxy S6 on Verizon?

Is there a way I can unlock the Galaxy S6 on Verizon? If so, where, and for how much? Also, I only have a Verizon SIM. In the phone settings, would I be able to switch to say, T-Mobile like you can on an unlocked iPhone?

Sorry if this is an obvious answer. I'm new to the whole unlocking thing.

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