Used to work with a radio enthusiast on sailing ships, he’d make posts to social media and check his email literally 1000 miles out to sea via radio.

You could try a ship’s bell app, there are a bunch out there. They chime every half hour

I still write 2 cheques a year because my water bill can only be paid via physical mail (or in person I guess), I’m pretty sure fax is still common in our medical industry.