Service end date is when your service days run out. Every time you add airtime it also includes SERVICE DAYS. A 90 day 60 minute card is good for 90 days.
If you add another airtime card before the 90 days runs out, then your leftover minutes (or min/texts/Mb for an Android phone) will roll over into the newly extended service period and the new Service Days will be added onto the end of your service end date (so you don't have to worry about losing anything due to overlap). But if you let your service days run out (reach the service end date without adding more airtime) then you will lose all of your minutes and rollover (min/texts/Mb for Android Tracfones) and the phone will stop working. About 30 days later, you will lose your phone number and it will be given to someone else.
Basically, if you want a functioning phone and don't want to lose your rollover airtime, you never let service days run out. And there is no penalty for adding airtime early since it will just add the service days to your old service end date. This is not unusual - there are no phones that let you add a small amount of minutes and then pay nothing, keeping them just for emergencies.
All prepaid phones either make you pay monthly or make you keep service days current. Tracfone is the best deal for a light phone user. The 90 day 60 minute card and the 1 year 400 minute card are the best deals if you are a light user, working out to about $8/month, with the 1 year option giving more average airtime (or airtime/texts/Mb for Android Tracfones) per month.
I am pretty sure that means all your stuff expires if unused and you will only be able to call 911 unless you pay for more use.
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