Per their spec sheet it doesn't have cellular connectivity, so it's not actually a phone.

And if what you want is a PDA that runs Linux, there are many options, e.g. https://www.clockworkpi.com/home-uconsole.

Neat concept.

For anyone else failing to resolve DNS for that domain: https://archive.is/q7w0x

Precursor is neat, but it isn't a phone.

Pretty sure Bunnie named it “precursor” because the plan is to make the actual phone (with a cellular modem) next. If I had the cash to support him and buy a Precursor I would.