How to unlock iphone 4 sprint with no sim card?

I have a sprint iphone 4 and its 6.1.3 and there's no sim card i was wondering is there anyway i can unlock it to any no contract please help me to which company would be best for my phone

It's a CDMA phone, which means it really can't be unlocked at all. The only carrier it'll work with besides Sprint is maybe some other prepay/no contract CDMA carrier, such as Cricket, who would "flash" it (reprogram it) to work on their network.

(The other big CDMA carrier is Verizon, but Verizon never lets you activate Sprint phones and vice-versa).

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