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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.