Some information about mobile security from recent BlackHat Conferences

ASIA-2017:

3G/4G INTRANET SCANNING AND ITS APPLICATION ON THE WORMHOLE VULNERABILITY

MOBILE-TELEPHONY THREATS IN ASIA

USA-2017:

New Adventures in Spying 3G and 4G Users: Locate, Track, Monitor

SS7 Attacker Heaven turns into Riot: How to make Nation-State and Intelligence Attackers` lives much harder on mobile networks

Ghost Telephonist - Link Hijack Exploitations in 4G LTE CS Fallback

more information on BlackHat site