https://arstechnica.com/gadgets/2023/04/old-phones-can-be-single-board-computers-as-this-mini-music-server-proves/

David Hamp-Gonsalves had two things quite a few people have these days: old phones lying around and a slowly building desire to get another Raspberry Pi for a quirky personal project.

The project this time was a personal music streaming server (detailed in full on GitHub). While Pi inventories are slowly improving, they're still not quite what they were, as a glance at rpilocator shows. What is far more readily available is the old Samsung Galaxy S7 phone in your drawer. Hamp-Gonsalves had one with a broken charging port, and a friend had another one with a bad battery, and one transplant later, he had a test model.