After digging out the iPhone 4S for a couple of weeks I dug a bit deeper...
Using the Motorola flip for now, nice and loud and the battery still lasts 3~4 days
Sadly the brick doesn't seem to work. It turns on, the backlight works fine, but nothing displayed on the LCD (although I can see it's powered as I can see all the segments if I tilt it against the light).
So, c'mon then, we love vintage watches, dig your vintage phones out and lets see what you've got!