Doesn't/didn't AT&T also add a header of their own? http://blog.jgc.org/2012/02/mobile-subscriber-leakage-in-http.html http://blog.jgc.org/2012/02/mobile-subsc

Doesn't/didn't AT&T also add a header of their own? http://blog.jgc.org/2012/02/mobile-subscriber-leakage-in-http.html http://blog.jgc.org/2012/02/mobile-subscriber-leakage-in-htt... http://developerboards.att.lithium.com/t5/Technical-Questions-Discussion/X-Up-Subno-uniqueness/td-p/23475 http://developerboards.att.lithium.com/t5/Technical-Question...