I have high speed bandwith and TOR is reliable for Sphinx, just a bit slow.
You can use VPN as well but I didn't try it yet 

You have Sphinx for phone, but you need to link it with your node over Tor and that will be a hassle.

DarthCoin

Wow Juggernaut looks great for what I need, that's sad..
Will check the other but it seens that there is no native messaging only app for lightning on phone device.

laiin

bitcoin

Message app based on lightning

- Thunderhub node management chat: https://thunderhub.io/
- Sphinx: https://sphinx.chat/
- Juggernaut: https://www.getjuggernaut.com/ (abandoned project, I don't know why, was an interesting project)
- Keysend: basically any LN node could send a message to another node, with a min cost of 1 sat.
- Blixt chat: https://chat.blixtwallet.com/ (also keysend inside Blixt node wallet)
- Impervious: https://www.impervious.ai/
- Keet: https://keet.io/ - is not based on LN but is using LN as payment network inside the app.
- LNTXBOT: https://lntxbot.com - LN Telegram bot, you can attach messages with a payment

I am sure are more, but can't remember now.