Mobile tracking by your ISP -- connecting via LTE/4G/3G, and not over WiFi. (If re-checking, make sure to refresh the page, or wait a few minutes to test again).
http://lessonslearned.org/sniff
As long as tracking of browsing history exists, adblockers will exist.
http://www.techspot.com/news/58599-v...rs-online.html
Verizon Wireless Injecting Unique Identifiers Track Subscribers Online