Yessss . I phoned 3 and asked them about this .. and the newbie said yes they are packet sniffing. And you know what !! They put me straight back onto the one plan with unlimited tethering3 UK. been there done that.
It's unlimited if you're just using it on your phone, with the default browser. Change your browser and 3 will accuse you of tethering.
That should work, you're basically spoofing the browser User Agent String, to be the same as the default one. The evidence so far would indicate that 3 UK uses deep packet inspection to detect tethering.
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