SS7 is like TCP/IP in the 1990s. It used to be quite a secure network because nobody outside the organizations (here, the mobile operators and telecom companies) were connected to it. Now it's getting interconnected to new actors which are not that trustworthy. Somehow, hackerdom made SS7 come into existence thanks to the massive use of Blue Boxes. Now, hackerdom is getting its toy back! SS7 is nowaday more and more accessible, and as such increasingly vulnerable. So we're getting exposed to a totally new set of protocols, as secure as TCP/IP in the 1980s. This looks like the Blue Box is coming back to life, in a very different form.