Hosting on a mobile connection (3G/4G/5G) is very hard, as nearly all of them have a CGNAT that prevents outside access to your server. You could in theory set up a VPN with Wireguard or something like Tailscale, but that is not so easy.
If that is all you have, I recommend renting a VPS somewhere instead.
Yes, I understand. I don't have a VPS or a Wi-Fi router, sorry. But if I get or have a VPS on my laptop, would that work? Or is there another way to access it without a VPS?
I think you mean a VPN (sorry those abbreviations are a bit confusing). Most consumer VPNs are not mean to host things. So you need to either set up a fully private one only between you and your friends (with Wireguard or similar), basically what Hamachi does, but more modern, or you need to get something like Tailscale that is specifically meant for exposing your server behind a CGNAT.
But the free tier of Tailscale will likely be insufficient, and once you pay, you might as well pay for a cloud server (VPS) and host the Luanti server there 24/7.
Is it just friends?
You could setup Netbird
An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server.
Available for Windows, macOS, GNU/Linux, FreeBSD, OpenBSD, DragonFly BSD, and Android.
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