What to do with old phones? - monero.town

I found a few old phones from my family. II cleaned them, installed LineageOS and rooted most of them. On one I installed postmarketOS, one is still stock Android and one is lets say bricked (after installing lineagesos it stay on boot logo for ever, before that I installed lineageos and nethunter on it). One one disk encryption doesnt work for some reason. Phones (all samsung galaxy): - S4 - A5 - A5 (bricked) - A5 (postmarketOS) - J3 - J4+ (no encryption) - A31 (stock) What can I do with them? Something like Monero node or Tor relay, but I’m already running that on old pc. For something that needs speed I have rpis (like a website). Camera security system? Tracking device? Is it possible to run (and autorun) cli apps and/or services that can access interent, bluetooth, gps, sensors, camera, files, etc. just like on linux? I’m a programmer and I don’t like making normal android apps for a simple project.