I have 3 lines on a GSM Family Nation plan with 700 minutes and Rollover.

If I add up each individual phone number, the total number of minutes used is 278. OLAM indicates that I have used a total of 549, with 851 minutes remaining. I have 969 Rollover minutes.

If I have a 700 minute plan, why is it telling me I have 851 minutes remaining ??

Thanks