Resource :
https://en.wikipedia.org/wiki/Signalling_System_No._7
https://github.com/CellularPrivacy/Android-IMSI-Catcher-Detector/wiki/glossary-of-terms
https://www.xda-developers.com/4g-lte-vulnerability-enables-eavesdropping-on-conversations-and-all-data-traffic/
Flaw allows eavesdropping and tracking of mobile phone users
https://www.wired.com/2014/08/gyroscope-listening-hack/