Researchers Convert Old Junk Smartphones Into Mini Cloud Computing Platform

IE-waste is a very serious problem, and researchers have been studying how to reduce, reuse and reuse old technology as long as there is old technology to be recycled. Google Research and the University of California San Diego have come up with a great way to deal with at least some of it.

The researchers used 2,000 discarded Google Pixel phones building a small computer platform. Unlike the famous Taiwanese giant who played Pokemon Go on 64-bit phones, the old Pixels underwent extensive modifications before being placed in their new home. Removed motherboards are placed in self-contained clusters of 25 to 50, according to the study.

Motherboards have been stripped of their Android operating systems and replaced with Linux, which has removed many consumer-facing protections, such as a low-memory kill function that helps phones run more smoothly, but doesn’t conflict with the server context. Everything that was unnecessary, such as displays, cameras and batteries, was removed, leaving the motherboards to do their thing.

“Each smartphone ‘server’ is the size of a standard data tray,” Ryan Kastner, a professor of computer science and engineering at UCSD, told CNET via email. As we remove the battery, chassis, and display, each device is much smaller than the bare phone.”

This setup was very successful. According to Google, the Pixels performed better or at least on par with professional rack servers such as the Asus RS720A, a popular choice for business data centers. This enabled them to address UC San Diego’s needs, including a small-scale cloud computing platform that could run classroom applications.

UC San Diego says 20 pixels is enough to support a classroom of over 75 students, and at 2,000 pixels, it can support 100 classes at once. Computer science and engineering will be the first classes to explore the technology.

“In the long term, we think other departments could move some of their computing needs to these systems as well,” Kastner said. “To enable us to do this, we are working to integrate the smartphone clusters into the UCSD Data Science and Machine Learning Platform, which serves as a central computing resource for education and research across campus.”

UC San Diego’s biggest win was at a cost. The price of the Pixel phones and the time it took to set them up was a “fraction of the normal cost” of a comparable amount of server computing power. UC San Diego aims to study how long consumer-grade electronics can last in a highly rugged server environment and plans to launch the program in the fall 2026 semester.

It is not an easy process

The test is undeniably ambitious and, if the UC San Diego team succeeds, it could represent a significant achievement. But it was not easy. Beyond challenges such as removing batteries to reduce fire hazards, researchers have had to navigate a number of additional technical and operational hurdles.

“These devices were never designed for data center use,” Kastner said. “That means we have a lot of exciting unknowns to answer, as well as the problem of getting the hardware to fit into an uneven hole.”

Another issue concerns the wireless communication systems that come with all smartphones, including Bluetooth, Wi-Fi, and cellular signals. Kastner said this would cause “massive disruption” if stopped, affecting a wide range of jobs. All of those connections also pose security risks, as even one hacked phone can leak confidential information. To avoid such problems, the team ensured that all radios are permanently disabled.

Another obstacle was the heat. The team uses standard data center cooling methods, such as fans and heatsinks, to dissipate heat. Smartphones have many consumer protections in place to prevent them from overheating. These protections are not needed in a datacenter environment, so the team spent a long time finding and disabling these protections, an action Kastner refers to as “a needle in a haystack.”

Part of the test is to see if these higher temperatures affect long-term reliability.

“Giving these smartphones new lives is no small feat,” said Kastner. “Reengineering a smartphone to function as a general-purpose computing processor capable of handling various cloud workloads was a major challenge and required undoing many of the complex techniques required to function as a smartphone.”

A small solution to a big problem

Although small in scale, the experiment can pave the way for further academic research. Google says that most school applications, including teaching, grading and even research, are “within the power of a single smartphone to handle.” If UC San Diego’s experiment is successful, colleges around the world could use old, discarded smartphones in the same server setup to help keep costs down.

However, this approach is not the next big thing in data center or server architecture. Data centers can process hundreds of gigabytes per second at low bandwidth. Data centers for AI and other business applications require very large, powerful and robust solutions, which bring a completely different set of environmental concerns, such as the large amount of water they need to keep cool and the fact that some data centers use enough electricity to power tens of thousands of homes.

There’s no chance that a gaggle of old smartphone motherboards will have an impact on the wider data center industry, but it’s good to see it working on a smaller scale, where businesses and researchers alike tend to overpay for cloud computing power when they don’t really need it.

A drop in the e-waste bucket

It is commendable that researchers and companies are looking for ways to use waste, but they still have a long way to go. The 2,000 smartphone server farm built by UCSD has removed a small fraction of the estimated 62 million tons of e-waste that enters the trash stream each year, of which only 22.3% is properly recycled. CNET readers perform better than averagerecycling of old technology 39% of the time, but that is still a concern.

An estimated 5.3 billion cell phones are thrown away each year. That means UCSD would need to build another 2.65 million such server farms per year, forever, to clean them all up. There is no expectation that any university will do so, but it shows how big the e-waste problem is. Those numbers also don’t account for the large number of older people who keep older technology in the closetgathering dust.

Some programs help with this. Right-to-repair laws in the US make it easier and more affordable to repair technology instead of just throwing it away. Governments and companies are working to raise awareness of proper e-waste recycling so that these metals and chemicals can be reused instead of being left to rot in a landfill somewhere.

If the UC San Diego experiment proves successful, it could be another in a long line of small initiatives to help clean up a problem once considered out of control.