We purchased a Tracfone last year for our son and bought the double minutes card with a years service. I've since taken over that phone and bought another Tracfone for him. He doesn't use that many minutes so we won't do the double minutes on the his new phone. The year will be up next week for the double minutes plan and I'm wondering what I should do now. The phone still has 500 minutes on it (we did referrals and bonus minutes) and we've never used the double minutes feature. I was thinking of buying 400 minutes (making 800 total). How does Tracfone know to double your minutes when you add minutes? Also, can you still use a code and also double your minutes? Is the 400 minutes deal the best value? Any tips appreciated.