Are you eligible for gift card promotion transferring a google voice number?

Does anyone know or has anyone successfully received the gift card promotion for "transferring a number from another carrier" by transferring a number from Google Voice?  My husbands current device is owned by his company so he can't transfer the number.  The latest $200 promotion is only for a transfer of a number.  Was thinking of getting a google voice number, paying the $3 to unlock it and then transferring it to be eligible for the $200 promotion that is going on now.  Anyone try this before or know if it will work?