What Is A Computer?

March 14, 2026 by Elliot Williams 36 Comments

On the podcast, [Tom] and I were talking about the new generation of smartphones which are, at least in terms of RAM and CPU speed, on par with a decent laptop computer. If so, why not just add on a screen, keyboard, and mouse and use it as your daily driver? That was the question posed by [ETA Prime] in a video essay and attempt to do so.

Our consensus was that it’s the Android operating system holding it back. Some of the applications you might want to run just aren’t there, and on the open side of the world, even more are missing. Is the platform usable if you can’t get the software you need to get your work done?

But that’s just the computer-as-a-tool side of the equation. The other thing a computer is, at least to many of our kind of folk, is a playground. It’s a machine for experimenting with, and for having fun just messing around. Android has become way too polished to have fun, and recent changes on the Google side of things actively prevent you from installing arbitrary software. The hardware is similarly too slimmed-down to allow for experimentation.

Looking back, these have been the same stumbling blocks for the last decade. In 2018, I was wondering aloud why we as a community don’t hack on cell phones, and the answer then was the same as it is now – the software is not friendly to our kind. You can write phone apps, and I have tried to do so, but it’s just not fun.

The polar opposites of the smartphone-as-computer are no strangers in our community. I’m thinking of the Linux single-board computers, or even something like a Steam Deck, all of which are significantly less powerful spec-wise than a flagship cell phone, but which are in many ways much more suitable for hacking. Why? Because they make it easy to do the things that we like to do. They’re designed to be fun computers, and so we use them.

So for me, a smartphone isn’t a computer, but oddly enough it’s not because of the hardware. It’s because what I want out of a computer is more than Turing completeness. What I want is the fun and the freedom of computering.

No More Paperweight: This Vintage Brick Phone Is Back Online

March 13, 2026 by Matt Varian 20 Comments

Remember those brick cellphones in the 1990s? They were comically large by today’s standards. These phones used the 1G network to communicate and, as such, have been unusable for decades now. However [Alan Boris] has resurrected this classic phone to operate today.

Originally costing as much as today’s top-of-the-line phones, but instead of weighing just a few ounces this classic Motorola DynaTAC 8000 Classic 2 tips the scales at a hefty 1.5 lbs. [Alan Boris] decided to not just bring the electronics back to life, but to even stuff a modern cellphone inside it to make it fully functional. Given the size of this phone, finding room for the new innards wasn’t much of a challenge. In fact, after the retrofit there was less in the phone than when it started life.

Using a perfboard and some tactile switches he was able to sense the button presses on the phone’s keypad and relay those to a Raspberry Pi Pico 2. The Pico in turn drove a small color LCD to replicate the original screen and controlled a pair of ADG729 boards used to dial the BM10 cellphone within this cellphone. The BM10 is a cellphone about the size of a 9V battery, making it easy to put inside the DynaTAC and bring the handset back to the modern cellular network.

Thanks [Alan Boris] for the tip! Be sure to check out our other cellphone hacks as well as some of our other retrofit hacks.

Continue reading “No More Paperweight: This Vintage Brick Phone Is Back Online” →

Why Samsung Phones Are Failing Emergency Calls In Australia

November 19, 2025 by Lewin Day 66 Comments

We’re taught how to call emergency numbers from a young age; whether it be 911 in the US, 999 in the UK, or 000 in Australia. The concept is simple—if you need aid from police, fire, or ambulance, you pick up a phone and dial and help will be sent in short order.

It’s a service many of us have come to rely on; indeed, it’s function can swing the very balance between life or death. Sadly, in Australia, that has come to pass, with a person dying when their Samsung phone failed to reach the Triple Zero (000) emergency line. It has laid bare an obscure technical issue that potentially leaves thousands of lives at risk. Continue reading “Why Samsung Phones Are Failing Emergency Calls In Australia” →

Smartphone Sensors Unlocked: Turn Your Phone Into A Physics Lab

September 7, 2025 by Matt Varian 18 Comments

These days, most of us have a smartphone. They are so commonplace that we rarely stop to consider how amazing they truly are. The open-source project Phyphox has provided easy access to your phone’s sensors for over a decade. We featured it years ago, and the Phyphox team continues to update this versatile application.

Phyphox is designed to use your phone as a sensor for physics experiments, offering a list of prebuilt experiments created by others that you can try yourself. But that’s not all—this app provides access to the many sensors built into your phone. Unlike many applications that access these sensors, Phyphox is open-source, with all its code available on its GitHub page.

The available sensors depend on your smartphone, but you can typically access readings from accelerometers, GPS, gyroscopes, magnetometers, barometers, microphones, cameras, and more. The app includes clever prebuilt experiments, like measuring an elevator’s speed using your phone’s barometer or determining a color’s HSV value with the camera. Beyond phone sensors, the Phyphox team has added support for Arduino BLE devices, enabling you to collect and graph telemetry from your Arduino projects in a centralized hub.

Thanks [Alfius] for sharing this versatile application that unlocks a myriad of uses for your phone’s sensors. You can use a phone for so many things. Really.

Continue reading “Smartphone Sensors Unlocked: Turn Your Phone Into A Physics Lab” →

Knowing That It Is Possible

September 6, 2025 by Elliot Williams 10 Comments

We like to think that we can do almost anything. Give me a broken piece of consumer electronics, and I’ll open it up and kick the capacitors. Give me an embedded Linux machine, and I’ll poke around for a serial port and see if it’s running uboot. But my confidence suddenly pales when you hand me a smartphone.

Now that’s not to say that I’ve never replaced a broken screen or a camera module with OEM parts. The modern smartphone is actually a miracle of modularity, with most sub-assemblies being swappable, at least in principle, and depending on your taste for applying heat to loosen up whatever glue holds the damn things together.

But actually doing hardware hacking on smartphones is still outside of my comfort zone, and that’s a shame. So I was pretty pleased to see [Marcin Plaza] attempt gutting a smartphone, repackaging it into a new form factor, and even adding a new keyboard to it. The best moment in that video for me comes around eight minutes in, when he has completely disassembled all of the modules and is laying them out on his desk to see how little he needs to make the thing work. And the answer is batteries, motherboard, USB-C, power button, and a screen. That starts to seem like a computer build, and that’s familiar turf.

That reminded me of [Scotty Allen]’s forays into cell-phone hackery that culminated in his building one completely from parts, and telling us all about it at Supercon ages ago. He told me that the turning point for him was realizing that if you have access to the tools to put it together and can get some of the impossibly small parts manufactured and/or assembled for you, that it’s just like putting a computer together.

So now I’ve seen two examples. [Scotty] put his together from parts, and [Marcin] actually got a new daughterboard made that interfaces with the USB to add a keyboard. Hardware hacking on a cellphone doesn’t sound entirely impossible. You’d probably want a cheap old used one, but the barrier to entry there isn’t that bad. You’ll probably have to buy some obscure connectors – they are tiny inside smartphones – and get some breakout boards made. But maybe it’s possible?

Anyone have more encouragement?

Turning Old Cellphones Into SBCs

April 8, 2025 by Elliot Williams 35 Comments

[David] sent us a tip about a company in Belgium, Citronics, that is looking to turn old cellphones into single-board computers for embedded Linux applications. We think it’s a great idea, and have long lamented how many pocket supercomputers simply get tossed in the recycling stream, when they could be put to use in hacker projects. So far, it looks like Citronics only has a prototyping breakout board for the Fairphone 2, but it’s a promising idea.

One of the things that’s stopping us from re-using old phones, of course, is the lack of easy access to the peripherals. On the average phone, you’ve got one USB port and that’s it. The Citronics dev kit provides all sorts of connectivity: 4x USB 2.0, 1x Ethernet 10/100M, and a Raspberry Pi Header (UART, SPI, I2C, GPIO). At the same time, for better or worse, they’ve done away with the screen and its touch interface, and the camera too, but they seem to be keeping all of the RF capabilities.

The whole thing runs Linux, which means that this won’t work with every phone out there, but projects like PostmarketOS and others will certainly broaden the range of usable devices. And stripping off the camera and screen has the secondary advantages of removing the parts that get most easily broken and have the least support from custom Linux distros.

We wish we had more details about the specifics of the break-out boards, but we like the idea. How long before we see an open-source implementation of something similar? There are so many cheap used and broken cellphones out there that it’s certainly a worthwhile project!

A design sketch of a partially disassembled candybar mobile phone. The enclosure is a clamshell of plastic that envelops the functional internals of the device and is illustrated to the right upper corner of the image, slightly overlapping the internals evoking the idea of the internals being inserted into the cover. The words "buttons part of the cover" are written toward the top with an arrow toward the numpad and "plastic shell with various design" is written toward the bottom with an arrow toward the translucent blue shell.

The Nokia Design Archive Is Open For Viewing

January 21, 2025 by Navarre Bartz 19 Comments

During the Cambrian Explosion of cellphone form factors at the turn of the millenium, Nokia reigned supreme. If you’d like to see what they were doing behind the scenes to design these wild phones, you’ll love the Nokia Design Archive from Aalto University.

Featuring images, presentations, videos and a number of other goodies (remember transparencies?), this collection gives us some in-depth insight into how consumer products were dreamed up, designed, and brought to market. Some projects require more reading between the lines than others as the Archive is somewhat fragmented, but we think it could still be an invaluable peek into product design, especially if you’re working on projects that you want to be usable outside of a hacker audience.

The Archive also includes approximately 2000 objects including many unreleased “unknown” models and prototypes of phones that actually did make it into the wild. While we’d love to get our hands on some of these devices IRL, having images with reference colors is probably the next best thing. Having replaced a number of smartphone screens, we hope more hackers take up the buttons and indestructible casing of these elegant devices for a more civilized age.

Thanks to [Michael Fitzmayer] for the tip! Be sure to checkout his work on Nokia N-Gage phones, including an SDK if you too love to taco talk.