I have my account set to turn off data at 990MB so that it doesn't go over 1024 and into the next tier. However, this almost never works. For the current month, data stopped but not until they hit 1039. At that point, I'm going to get charged for the next tier and it's useless to turn it off. I would think if I set it to stop at 1023, it should stop at 1023, not let it keep going and going. Is this always going to be the case that the limits are just fuzzy lines?
Alerts don't stop a service in time, usually go over before stopping