Which cell phone app are you using and you are using tailscale 1000.xx.xx.x address?With the configuration you describe you should not need a subnet router.
I have a configuration very similar to yours. make sure that Tailscale is up and running on each device on your Tailscale network. Do that by checking each device to make sure Tailscale is running and active, and then also go to your Tailscale administrative panel and make sure that it shows each device active on your tailnet.
The documentation for Tailscale, available from their main website is reasonably comprehensive. I set mine up many months ago, and no longer remember the specifics, but there are some quirks relating to settings for Linux. I am away from anything other than my cell phone so can’t right now help much more than to offer that you try to track those Linux idiosyncrasies down in their documentation. I am using Debian 11 and got mine all working splendidly, even with the additional complexity of a subnet that I needed to be able to bring my obi200 into the tailnet. I had to do that, because the obi cannot natively support Tailscale and i had to use a subnet to get it onto the Tailscale network.
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