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Netbird is king.
(lemmy.fedioasis.cc)
Figured I'd give Netbird a go, glad I did because I can self host extremely easily by using the new services feature.
You specify a subdomain, point to a peer, specify a protocol and port, and you are good. NetBird fetches you the certificate and your site goes live fast.
I can use my Immich with my mobile data now.
Edit: Note that I choose to self host NetBird, and haven't really used the service they provide all that much.
There is an alternative unofficial app available on F-Droid called JetBird.
It is as valid as the official one.
To reduce battery usage, you may want to try Netbird's Lazy Connections feature.