I was looking throught my new Iphone 3gs and this question hit me. I've read posts here saying to keep your tethering to a minimum becasue the vast amounts of data transmission could raise flags for AT&T (eventhough we have unlimited data). So my phone says in the life of the account I've received 44.5 GB of data, I don't know if that's since last year when i got my 3g or the year before when i got the 2g. Either way i've not been shy with the usage of my Iphone and I've never tethered....untl like 3 days ago when someone posted how to activate it on 3.0. Anyway to the question, I've essentially used between 1.8 gb and 3.7 gb of data a month, how much could tethering now cause AT&t to be concerned or even know i'm using it?...I podcast A LOT at work if your wondering. All opinions welcome.