Panasonic, I am wondering how ur friend was billed $1200. As a consious customer we have to keep track of how many minutes we have, its very easy and it doesn't cost at all. AT&T definitely adds the roll over minutes I think ur friend was unaware of the remaining minutes and used the calls. Me personally check my minutes everyday online its so simple and easy, just log on and check the used , remaining and rolll over minutes. If we have any questions then we can call the customer assistance and even there is online chat for customer assistance with AT&T. Little note: I am not marketing guy of AT&T hai feri.