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Turn A Broken Phone Into A Home Server
(youtu.be)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Loved the concept of the video: in our desks and pockets we have powerhouses that are underused. I think the solution proposed is too convoluted though as you can get to similar results with Termux without root.
And to those who mention the battery issue, there're ways to address this problem without the need of a physical mod. Just a few suggestions here: