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You can turn an old phone or laptop into a wifi extender.
You can use an old iPhone to get iMessage working on an android.
If you attach a lens to it you can use your phone as a binocular
You can use your phone to scan a document and turn it into a digital file.
You can use it to make a signature, upload to computer to make a legally binding e-signature (the security of this is ambiguous, do at your own risk).
Theres probably an app somewhere to use it as a trackpad (if not can somebody please do this).
I'm pretty sure there's an app to use it as a secondary monitor for your PC or laptop
If you ever repair or fix things, take pictures at various points to have a reference to how it comes back together.
It you ever need to remember anything just take a picture. (Use this all the time at work for stocking things, take a picture of its location address, walk down the warehouse etc)
I think there's an app to use it as an angle gauge by tilting it. Used for hanging pictures and stuff.
Probably a pair of calipers with the right app and calibration.
You can get a "remote controlled button presser and switch flicker". You attach it to a light switch or anything else to remotely activate it. Great for turning on and off a space heater or computer.
Use an old one as a remotely viewable security camera, with battery.
Pierce the battery to make a fire (can only be used once)
That's about all I can think of right now
kde connect allows you to use the phone as a trackpad