What the cell...? Telcos around the world were so severely pwned, they didn't notice the hackers setting up VPN points

Revealed: Long-running espionage campaign targets phone carriers to snoop on VIPs' location, call records

Hackers infiltrated the networks of at least ten cellular telcos around the world, and remained hidden for years, as part of a long-running tightly targeted surveillance operation, The Register has learned. This espionage campaign is still ongoing, it is claimed."