Is it possible to unlock Sprint iPhone 5'and newer iPhones?

I have been reading on Sprint's customer forums that it is possible to unlock Apple iPhone 5, 5c and 5s phones on Sprint's network. Is this true?

Added (1). Or is Verizon the only one whose iPhones come unlocked?

Added (2). Even though I have chosen a best answer, please feel free to answer this question. Serious answers only, please.

No, none of the current Sprint iPhones can be unlocked for use on other US Carriers. It's a limitation of the hardware, Sprint iPhones contain very specific radios to communicate with the cellular network.

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