One thing I want to bring up just so you’re conscious of it is WiFi calling.
I currently use Tailscale and a sophisticate 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 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.
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