Actually 5G provides this overhaul, more than it provides speed benefits for customers. The 4G backend still has a web of trust between operators and their e.g

Actually 5G provides this overhaul, more than it provides speed benefits for customers. The 4G backend still has a web of trust between operators and their e.g. IP exchange providers. As far as I know, this will change with 5G. Roaming data confidentiality can then be routed and encrypted until the home operator network, while the associated metadata is accessible for the IP X to provide their services. The home operator can verify the smartphone is actually in the visited network. These are all bits and pieces that break up the operator's web of trust.