Is there a charge for transferring my Grasshopper number to a different provider?
There are no additional charges for moving your Grasshopper number to another phone provider. However, in order to transfer a number from Grasshopper you must have an active Grasshopper subscription and your account must be in good standing. Once your phone number has been ported away successfully, you can contact Grasshopper to perform a cancellation.
For information on the cost of transferring a number from a separate provider TO Grasshopper, please check out THIS article .