AT&T headquarters, 60 Hudson Street, 33 Thomas Street—those 3 building are really important for the internet. [...] always fascinated me, the physicality of these buildings—and you can see all these markings on the streets, you can see these cables. All the kids in the neighborhood have myths about that building | via https://theintercept.com/2016/11/16/the-nsas-spy-hub-in-new-york-hidden-in-plain-sight/
The Intercept 19 Febr, 2015: "AMERICAN AND BRITISH spies hacked into the internal computer network of the largest manufacturer of SIM cards in the world, stealing encryption keys used to protect the privacy of cellphone communications across the globe, according to top-secret documents provided to The Intercept by National Security Agency whistleblower Edward Snowden."
US and British intelligence agencies undertake every effort imaginable to crack all types of encrypted Internet communication. The cloud, it seems, is full of holes. The good news: New Snowden documents show that some forms of encryption still cause problems for the NSA.