What to do with an old Samsung Galaxy phone?
Discussion
Use it as a detonator for C4
Use it as an iPod store music on it, stream audio on Wi-Fi, that’s what I’m using my old Moto G4 for
Turn it into a house remote for IOT shit? That's what I did with my old LG Nexus
reflash and use for travel
Recycling
Door stop
They usually run decent once freed by LineageOS. My backup phone is an S5, it runs fine.
Can also be used with Haven as a FOSS security camera system.
As a WiFi access point.
As a Reticulum / Sideband node.
As... well any server that runs on Android, really.