[Flockster]

I could not compare it completely, but it sounds very much like this talk that I saw many years ago at the CCC.

SS7: Locate. Track. Manipulate. [2014] https://media.ccc.de/v/31c3_-_6249_-_en_-_saal_1_-_201412271...

[effdee]

Tobias Engel's initial video about this was "Locating Mobile Phones using SS7" given at the 25C3 in 2008:

https://media.ccc.de/v/25c3-2997-en-locating_mobile_phones_u...