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https://www.thelightphone.com/

Modern laptops don't have PCMCIA slots ;-)

I'd like a business-card sized display that could show simple things like my calendar and contacts while being as thin as possible - a small BTLE and WiFi board attached to a .4 mm LiPo battery and an touch e-ink display on top of the whole thing would probably work.

> Modern laptops don't have PCMCIA slots ;-)

That's presumably where the USB-C and/or Bluetooth would come in. Nowadays it wouldn't be all that infeasible to have a flip-out USB-C plug.

Or hell, have the backside be a solar panel, and make the device entirely wireless.

A cellular modem requires a crapload of power though, unless you keep it off most of the time. There's a reason why modern phones have batteries as huge as they do.

There should be a handy physical switch to turn it on/off then.