Google tests turning old cell phones into servers to give them a second life

Google and the University of California San Diego (UCSD) are joining forces to tackle the growing problem of electronic waste by giving old smartphones a new purpose. Their joint initiative proposes an innovative solution: repurposing discarded smartphones into powerful, low-carbon cloud computing clusters.

Many users upgrade their phones every few years, often driven by new features rather than hardware obsolescence. These older devices, while no longer state-of-the-art, still possess capable processors, memory, and storage. Instead of ending up as e-waste, the project seeks to harness this existing hardware. A key focus is on reducing the "embedded carbon" – the emissions tied to manufacturing hardware – which is a significant challenge in the tech industry. By reusing smartphone motherboards, which account for about half of their embedded carbon, the project avoids the need for new raw material extraction and server fabrication.

The process involves extracting the motherboards from devices like Google's Pixel phones and removing components unnecessary for a server environment, such as screens and batteries. This not only saves space but also eliminates hazardous materials. The Android operating system is replaced with a general-purpose Linux distribution, and Kubernetes is used to manage tasks across the devices. Initial performance tests suggest that 25 to 50 smartphones are needed to match the power of a modern server, but with the advantage that a single smartphone core can often outperform many cores in traditional servers.

The ambitious goal is to deploy a data center composed of 2,000 Pixel smartphones by 2026. This cluster is intended to provide affordable, low-carbon cloud computing resources for students and faculty, supporting research applications and automated grading tools. Early experiments have shown promise, with a small cluster of 20 phones successfully handling class assignments with lower latency than current commercial services.