I want a thick clunky device without a screen that can run for 4-7 days without charging. Then i want 1) a normal size device, 2) a tiny one and 3) a tablet. These should be terminals, little more than a screen, a battery and some radio to communicate with the herefore mentioned brick that does all of the heavy lifting. It needs only 20-30 meter range. The brick may also feature a webserver captive portal with public…
Also, if you want really small device, I found smartwatches are nice adjunct to phone. Can check notifications and do basic things on watch instead of pulling out phone. The watch uses phone for data, but there is no point in terminals when smartwatch chip can handle that. There are watches with LTE that work without the phone.