Only T-Mobile can help you. Cricket doesn't play with Google Voice and Republic Wireless, they told me that my RW number is a landline. While I was talking to their support from my Moto X (on that RW account).
Get the cheapest T-Mo plan/SIM: http://prepaid-phones.t-mobile.com/pay-as-you-go
Port the number to T-Mo, wait a day and then port again to whomever you want.
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