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Only way I know how to do this on iPhone is to enable "Lockdown Mode" which also removes images from messages, etc. Is there another way?

AFAIK lockdown mode is the only way on iPhone. This will disable 2g, but not 3g.

Lockdown mode allows one to optionally disable 2g, maybe it is also the default there. One can turn 2g back on in said mode if desired.

As to 3g, it is largely switched off here, and I understand most of the rest of the world is also disabling it.

However it does not remove images from messages, it just disables certain automatic helpers - e.g. link previews etc.

One can still send photos, etc without any issue.

This doesn’t mitigate the issue that a malicious base station poses by downgrading a phone.

It doesn’t matter what the network supports. It matters what the phone supports