What can I do with my old-but-functional android smartphone?

I kept my old phone (an AT&T-locked Samsung Galaxy S7) going for 10 years, replacing the battery midway through and using it well into unsupported territory. I like to keep things working as long as I can within reason, and I also know that this phone is destined to become e-waste as soon as I get rid of it.

But with more apps losing support, and electronics prices on the rise, it felt like now was finally the time to upgrade (to a refurbished Pixel 8 Pro). So I got a new phone...

Still, I don't want my old locked Galaxy S7 phone to go to waste just yet while it's still roughly working!

So does anyone have any idea of things that I can do to reuse or repurpose my old phone?

I have some ideas in mind myself, but I'm curious what you all think and if anyone has experience with repurposing old phones in interesting or useful ways.