I guarantee that if you’re here, you’re very likely to be extremely tech knowledgeable (compared to the large populace)

a phone needs to be able to make calls and send or receive sms…

Eh, there’s always something people with a lot of tech knowledge think are obvious to people without a lot of tech knowledge. Just look at the mess that Linux can be.

If I understand correctly, this thing turns your phone into a computer. But I need a phone…

To add to that, Maperitive is a fantastic piece of software (Windows only) to create your own custom maps for hiking or cycling with osm. A bit tough to wrap your head around unfortunately, but actually pretty powerful. Hmu if you need quick instructions

there could be a way maybe, by freezing water while keeping it extremely pressurized (extremely), you can make “efficient ice” that occupies less space, called ice VII, I’m not kidding. It would cost literally billions of dollars so not yet feasible, but it keeps my sci-fi loving mind at ease.