Get a prepaid with an eSIM with AT&T/Rogers (or any of their MVNO's) for maximum compatibility; cheapest the better. You need an eSIM compatible phone. You can verify this through the carrier's site from your phone.
get a wildcard like *.example.org and you'll be done for everything
This actually only covers the subdomain. It doesn't extend to *.network.example.com. I spent last Saturday fighting my browsers until finding that out.
My 170lbs dog could eat me if he decided to. He would get less cuddles then so he has high incentive not to