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You can joke about Microsoft Teams not being a real messaging platform, but running it on a network that's physically separated from the Internet is quite effective at keeping random journalists out of your chat groups.

But how do you connect to this network from a mobile phone, for example, when playing golf?

install teams on your phone? you'll need to cave a bit and allow VPN access from the phone to the Teams server, though.

In practice? You are issued a special, secure phone expressly for connecting to the network which is not physically connected to the internet. Many details of e.g. CsfC are unclassified; you can read the architecture pdfs.

Reminds me of how the British government runs on WhatsApp.

German government seems to be trying the Matrix network.