Tried this... didn't work...
Let me preface all this by giving my facts. I'm a consultant so I'm on the road and traveling 3/4 weeks a month and since 3G is usually better than hotel wifi and I have slingbox... i tear through about 8-12 gigs a month, even without teathering. I now use my ipad and since using mywi, haven't noticed any huge jumps in data usage... still average 8-12 gigs. I had been laying off the mywi and hadn't used it for about 2 weeks when the first batch of notices started rolling in. I didn't recieve anything. I finally got brave enough to start using mywi again late last week and only used it lightly... low and behold i get the email yesturday!
I called in, played dumb and went through the whole "i use a ton of data" and I travel alot, i don't know how i could teather since i'm still on the original OS and havent' upgraded to the one where apple enabled it... yadda yadda...
The rep seemed VERY smart and knew what she was talking about. I doubt she was buying my playing dumb but she iterated to me multiple times that it has nothing to do with the amount of data being used or spikes in data usage, that they were able to detect how the data was used and at some point i had used my phone to transmit data to something other than my phone. She said I don't need to do anything and my account wouldn't be touched... as long as i don't teather anymore.
I wasn't a believer that they were actually doing packet sniffing or anything like that, I was convinced it was entirely data driven, but seeing that they caught me litterally days after using mywi for the first time in about a month, and i was blatently told that they could see my data... I'm now confident they CAN detect teathering and they will eventually nab everyone who's currently doing it.
It was a fun ride while it lasted, and my ipad just took a big usability hit, but oh well. I'm willing to pay for teathering, but not at the expense of $40 more a month just to go from unlimited data to 2 gigs with only 2 more gigs to teather. With my current usage and overage fees, it would cost me over $100 more a month to keep doing what i've been doing..... no thanks!
Just figured I'd inform you all of my scenario since there seems to be a lot of confusion out there right now!