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I'm guessing web browsing on browsers that are clearly PC/Mac desktop versions.

So you think they are parsing user agent strings out of HTTP requests? Seems unlikely.

Just periodically run a log scanner for requests for SWFs, etc. Lots of simple non-constant log scans will reveal this information.

I will use VPN or HTTPS proxy and will sue you if you will use that information for non-technical purposes.

If you're using a VPN, that ALSO is a dead giveaway protocol wise.

Good luck suing them. They offer tethering for a price, you're not paying it. I think the chance you'll get away with invasion of privacy on something that they technically should only see from flagged account is about 0.

Most mobile web access systems run through an explicit or transparent web proxy to downgrade image quality (=> reduce size) at least. Filtering on user agent would be trivial, though easy to work around.

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