An article published by International Institute of Cyber Security on May 11th 2015 describes how easy it can be to intercept mobile communications (calls and messages).
If your business can be of interest for competitors, criminal organisations or … then this is definitely something to be aware of, and maybe consider measures such as White Noise to encrypt these communications.
How to intercept mobile communications (calls and messages) easily without hacking
Monitoring cell phones without their knowledge is growing rapidly in Latin America countries like Argentina, Mexico and Brazil after being very famous in US since 2008
The Stingray/ GSM interceptor/IMSI catcher is equipment that can gather data from hundreds of phones over targeted areas and they can also perform denial-of-service attacks on phones and intercept conversations. Though these products are not available legally but they can be bought through black markets or through deep web.
Law enforcement and the military use these devices to track cellphones. A stingray system involves an antenna, maps, and a signal device. The device mimics as a cellphone tower Base Transmitting Stations (BTS) and gets the phones in the area to connect to it. Then it collects International Mobile Subscriber Number (IMSI) and the Electronic Serial Number (ESM) numbers associated with the phone and can connect any phone. …
