Had a quick scan of the speedify blog as mentioned in the post ‘Using Maidsafe as a VPN’ and found out about another insidious practice :
Unfortunately, it turns out Verizon Wireless isn’t the only carrier trading its users’ privacy for extra profit. It turns out that AT&T Wireless is up to the same nonsense. If you’re an AT&T Wireless customer, you can see for yourself by pointing your browser to this page and looking at your HTTP headers: request.urih.com
Not sure if this works for other carriers around the world
Apparently you can use a local Squid to get around this:
Tell squid to deny these headers. T-Mobile uses MSISDN, Verizon uses X-UIDH, and AT&T uses x-up-subno.
header_access MSISDN deny all
header_access X-UIDH deny all
header_access x-up-subno deny all