I just tethered for the first time ever on my jailbroken ip4 and I'm wondering if AT&T will look into it, be able to tell, send me letters, cancel account etc. I only plan on tethering for 2-3 days - I came home today and my internet wasn't working. I really needed it (work-related) so I saw a tethering app was free for a trial in Cydia and I tried it. I'm currently tethering now but my concern is that even just a minute few days of tethering will allow AT&T to catch on. I notice it tells you your usage down/up in the app. What is a number that will be crazy?