One of the largest investments a mobile phone operator makes is on their network. Network builds and maintenance run into billions of pounds as these companies seek to

maintain service levels, or improve their geographical reach and speeds. However the underlying software and signalling protocols they run on can often be flawed, leaving

them open to attack from outsiders. Juliette Foster was joined by Michael Downs, Head of Telecoms Security at Positive Technologies, to explain more about the risk to operators from such vulnerabilities.