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Wireguard comes with an example script [1] that does DNS updates for peers, which works well for me in a cron job. Archwiki also has an example for systemd timers [2]. But if your question is specifically about phones, then this might get a bit more complicated to set up.

[1] https://git.zx2c4.com/WireGuard/tree/contrib/examples/rereso...

[2] https://wiki.archlinux.org/index.php/WireGuard#Endpoint_with...

On Android the problem is the same. The Client only resolves the IP once. When the server gets a new ip, no connections can be made, although the client seem to be still connected.

I added a section on Dynamic IPs to the docs here:

https://github.com/pirate/wireguard-docs#Dynamic-IP-Allocati...