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AlexJ 2 points ago +2 / -0

Depending on what VPN service you're using, they probably provide a mobile app. some popular ones are IVPN, expressVPN and Mullvad VPN

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AlexJ 1 point ago +1 / -0

Check out the secure scuttlebut protocol. Very straightforward messaging via LAN.

Scuttlebot forms a global cryptographic social network with its peers. Each user is identified by a public key, and publishes a log of signed messages, which other users follow socially.

Scuttlebot searches the P2P mesh for new messages and files from followed users and from FoaFs (friend of a friend's). The messages and files are stored locally, indefinitely, for applications to read.