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What PhoneBot is
PhoneBot was described by Ruochen Hou, Quanyou Wang, Daniel Koh, and Dennis W. Hong in the arXiv preprint “PhoneBot: A Low-Cost Open Humanoid Robot Platform Reusing Smartphones,” posted 6 October 2026. The authors’ abstract states: “With fully open-source hardware and software designs, PhoneBot provides an affordable, reproducible platform for education, research, and rapid prototyping.” The project’s public website, accessed 9 October 2026, links to that preprint and adds little beyond it.
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The central idea is to avoid building a separate camera, inertial sensor, and computer stack for each robot. The phone already contains those parts, so the robot’s body can focus on joints, structure, and power. Because the work is a preprint and has not been published in a peer-reviewed venue, its claims should be read as the authors’ reported results rather than settled findings.
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Body and joints
The assembled robot measures 483 × 183 × 125 mm and weighs 1.8 kg, including the phone, actuators, structure, electronics, and battery. An independent summary published by Tech Xplore / Phys.org on 8 October 2026 describes it as about 48 cm tall, which matches the paper’s dimensions.
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PhoneBot has 13 degrees of freedom: six actuated joints in each leg and one torso-yaw joint. The yaw joint turns the upper body, and with it the phone’s camera, without turning the feet, so the robot can look toward a target while its legs keep their stance. The paper specifies the DYNAMIXEL XL430-W250-T servo motor for all 13 joints and identifies the actuators as the platform’s largest single expense.
The robot has no arms in its current form.
How the phone and the robot divide the work
The phone is not a passive camera mounted on a frame. It runs the locomotion policy and the vision functions. In the reported setup, data moves through the system in this order:
- The phone reads its own inertial measurement unit and captures camera frames.
- The locomotion policy and vision code running on the phone compute the next joint-position targets.
- The phone sends those targets over Wi-Fi to a small onboard computer on the robot.
- The onboard computer forwards the commands to the servos, which move the joints.
This split keeps the phone as the decision-making unit while a separate board handles the motor interface. In the current setup, spoken interaction is supported, but speech recognition and language processing run on an external laptop, not on the robot or the phone. Anyone reproducing the build should plan for that laptop dependency rather than assuming a self-contained robot.
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Which Android phones were tested
The paper reports testing its application on four Android phones: a 2017 Honor 9 and three other low-cost handsets. The authors report that all four handled the core application functions. That is the extent of the compatibility evidence. It does not establish that every Android phone will run PhoneBot.
The one specific failure recorded is ARCore SLAM on the Honor 9 in the United States. There, Google services were unavailable on that Huawei device, and SLAM did not work. Phones without Google services, or devices whose ARCore support differs, may face the same kind of limit. Check ARCore support for a specific handset before building around it.
What the paper demonstrates, and what it simulates
The paper reports three physical demonstrations: walking, tracking a human, and standing up from a fallen position. These are the results most directly tied to the hardware.
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The locomotion training comparison is different. It was run in simulation, with five independent random seeds for each condition, comparing training with and without sagittal mirroring. The authors report that mirroring improved learning speed and consistency in simulation and reduced simulated gait asymmetry. They also report deploying the resulting controls on the physical robot. The paper’s simulation results and its hardware demonstrations should be kept separate when judging how well the controller transfers to real movement.
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Build cost
An independent report from 8 October 2026 relays the researchers’ estimate of roughly $400 for the hardware, excluding the smartphone. That is an estimate, not a price quote, and it should not be read as a current parts list total. Actuator prices, shipping, and component availability can change, and the estimate does not state which exchange rate, supplier, or quantity it assumed.
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The $400 figure does not include the handset. A reader building a PhoneBot would also need a compatible Android phone, a small onboard computer, the 13 servos, structural parts, batteries, and a laptop for speech processing in the current configuration. Follow the project’s design and compatibility details for the exact components.
Limits to keep in view
- Terrain: reported locomotion training covers flat ground only.
- Manipulation: the robot has no arms and does not manipulate objects.
- Payload and vigor: an independent report notes that the inexpensive motors limit payload and how forcefully the robot can move.
- Speech: language processing runs on an external laptop in the current setup.
- Phone dependence: compatibility is shown for four handsets only, and one feature failed on a phone without US Google services.
- Autonomy: the paper describes a research platform, not an autonomous household helper.
How PhoneBot compares with OpenBot
OpenBot, described by Matthias Müller and Vladlen Koltun in an arXiv preprint posted 24 August 2020, is an earlier smartphone-powered platform. It uses a wheeled body, not legs. The comparison below shows where the two projects differ.
| Item | PhoneBot (Hou, Wang, Koh, Hong, 2026) | OpenBot (Müller and Koltun, 2020) |
|---|---|---|
| Body type | Bipedal humanoid, 13 degrees of freedom | Wheeled robot |
| Reported dimensions | 483 × 183 × 125 mm, 1.8 kg with phone and electronics | Not stated in the consulted summary |
| Reported body cost | About $400 hardware estimate, excluding the phone (reported 2026) | $50 body (historical figure from the 2020 paper) |
| Demonstrated behaviours | Walking, human tracking, standing up from a fallen position | Person following, real-time autonomous navigation |
| Main mechanical and control demand | Balance and coordinated gait across 13 joints | Driving a wheeled base |
The two cost figures come from different years, configurations, and scopes, so they should not be compared directly as a price difference. The more useful contrast is mechanical: a wheeled base is far simpler to keep upright and moving than a biped, which is why PhoneBot’s reported walking and stand-up results are the more demanding claims.
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Who should consider PhoneBot
PhoneBot fits readers who want a platform to study legged control, phone-based sensing, or low-cost humanoid prototyping, and who can accept flat-ground results, an external laptop for speech, and the need to verify components. It is a poor fit for anyone expecting a ready-to-buy robot, an arm-equipped assistant, or a demonstrated way to process old phones at scale.
Before committing to a build, confirm three things with the project’s own materials: that your Android handset is one the design supports, that you can source the DYNAMIXEL XL430-W250-T servos and the control hardware the paper describes, and that your use is limited to the flat-terrain behaviours the authors report.
The reported results support PhoneBot as a credible, open starting point for low-cost legged robotics. They do not yet support claims about broad phone reuse, everyday autonomy, or manipulation.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Ruochen Hou, Quanyou Wang, Daniel Koh, and Dennis W. Hong, “PhoneBot: A Low-Cost Open Humanoid Robot Platform Reusing Smartphones,” arXiv preprint, 6 October 2026.
Matthias Müller and Vladlen Koltun, “OpenBot: Turning Smartphones into Robots,” arXiv preprint, 24 August 2020.
Ingrid Fadelli, “PhoneBot gives old smartphones a new job on two legs,” Tech Xplore / Phys.org, 8 October 2026.
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