Comment by wirefloss

I finally found the way to watch the presentation (BTW it's good), and the author mentions femtocell hacking as "if you hack femtocells you _may_ have a chance to have access to SS7", or something like that, i.e. very uncertain. He emphasizes a different method -- getting a "global title". That's what I meant in my original comment -- you have to join the telco club, and that is not trivial.