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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

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Is there a way to guarantee a mobile device or tablet can only access my own services and block all other traffic? (lemmy.world)

submitted 3 days ago by [email protected] to c/[email protected]

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Is this possible on any modern day phone or tablet? Selfhosting as made me very privacy-consciouss and am concerned about my iphone.

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[–] [email protected] 6 points 3 days ago* (last edited 3 days ago)

One thing I want to bring up just so you’re conscious of it is WiFi calling.

I currently use Tailscale and a sophisticated setup to route traffic via commercial VPNs. I also do a ton of DNS ad/tracking blocking which Tailscale wasn’t really designed for (and requires a rat’s nest of routing, iptables and the like).

I’ve noticed I never receive incoming calls now even while attempting to send traffic to my carrier’s WiFi calling server (it’s just another traditional VPN server at a technical level) through the nearest Tailscale exit node.

All this is to say, if you want WiFi calling to work you should consider this. I believe it’s the same for Android and iPhone.

As for the traditional VPN bit I kind of discovered this a few years ago when using one of those mobile cellular gateways you can plug into your LAN (I lived in a dead zone). When looking up my current carrier’s WiFi calling server (a different carrier) I realized the port matches the same VPN thing they were doing on the cellular gateway, so I think it’s fairly common for wireless carriers to just use a VPN to get you into their backend.