SS7 is used in all kinds of operator messaging, so unless a network disables all 3G and lower (including when roaming), it'll stick around.
With 4G, a lot of SS7 functionality has been moved to a different protocol that's more resilient and less (obviously) designed to be used to spy on foreign assets. There's still a level of firewalling necessary for any operator that cares about security, but it's not nearly as bad as on SS7.
With 4G, a lot of SS7 functionality has been moved to a different protocol that's more resilient and less (obviously) designed to be used to spy on foreign assets. There's still a level of firewalling necessary for any operator that cares about security, but it's not nearly as bad as on SS7.