[Eiriksmal]

Could be 4G only? Just did it from a 4G LTE tablet, got a big ol' X-UIDH string of what appears to be Base64.

Edit: Also, on a positive match, the page displays a link to an NBC News article on Verizon's CPNI (Customer Proprietary Network Information).

http://www.nbcnews.com/tech/security/why-you-should-check-yo...

[ewzimm]

I get the header injected on 3g.