Your old phone is a better home server than a Raspberry Pi

Old smartphones can serve as surprisingly capable home servers, outperforming a Raspberry Pi in several ways: faster processors, built-in battery backup (UPS), and lower cost since you already own them. Using tools like Termux, UserLAnd, or PRoot, you can run Linux packages, host Docker containers (via QEMU/Alpine workarounds), set up AdGuard Home, run Samba or Nextcloud as a NAS, and more. Key hardware considerations include managing battery health with smart plugs or battery idle mode to prevent bloat and fire hazards, and adding heatsinks for thermal management under heavy loads.