[acdha]

The question I had is whether the femtocell claim is true - those are much easier to get access to. I'd like to believe that they're correspondingly more locked down but there is rather a long track record of telcos botching basic security design.

[noselasd]

The presentation linked at the bottom , http://conference.hitb.org/hitbsecconf2012kul/materials/D1T1... contains hints of numerous holes they've found in various networks, to among other things get access to an SS7 network.