Unfortunately Data Manager is useless in this scenario because it is all time based and assumes you are proactively needing to block data. If it were data % based it would be much more useful. Say something like block data until the end of the bill...
You won't receive the warning messages...only the line that is reaching that threshold gets those messages. You will only get the message when it is over the data amount and the account is blocked after they've ding'd you for $50. I've had this arg...
