This is an early work in progress project, but one I have had in mind for a couple years.
My plan is to gut this old pager, make a PCB modeled after the original to host a 128x32 OLED display, a micro-controller, and a battery. I am currently prototyping with an Adafruit Feather 32u4 RFM69HCW board and a PiOLED display.
Using the RFM69 radio, I can do all sorts of stuff like connect to my local Moteino gateway, turn lights on and off, get "paged" on certain events like a water leak, mailbox notifications, or even the doorbell, and keep the clock on the pager synced.
If I switch over to a micro-controller with BLE, I could pair the pager to my phone and receive notifications, much like many smart watches do today.
The possibilities of a small wearable Arduino platform in this form-factor are endless, and I am excited to explore the options!