Talk:United States/@comment-66.57.37.3-20100812175844/@comment-79.97.190.145-20150609095922

Carriers might do a shallow or deep packet inspection to determine if you're tethering or make some other tricks...

Examples are:

- check TTL values or manipulate them (ep. packets arriving at the phone have TTL set to 1, so they will not get routed)

- check for User-Agent header (when doing HTTP).