I just signed up AT&T 5GB data plan, with includes Wifi tethering. One thing I am confused about is the "2GB allowance" for tethering. I know that the second highest tier is 3GB, which does not include tethering. So, my question is, when they talk about "2GB allowance", does this mean I am only allowed to "tether" 2GB worth of data (and thus once I've used 2GB via tethering, I won't be able to tether any data again until the next month, although I will still be able to use the rest of the 3GB on the iPhone, or, if I wanted, could I tether all 5GB worth my available data if I never use any data on the iPhone alone?

Thanks for any help,
James