I changed to Unlimited last October. The Original plan I had expired in February of this year. There is no refund for the portion of the unused original plan. Even when you cancel the original plan it will remain active until the expiration date, it will just not auto renew. I didn’t feel like screwing around so I moved all my cam to CP unlimited and let the original plan expire, but I could have had half off the cams on one plan and the other half on CP Unlimited.