Phone Harness Launches Open Source Tools That Let AI Agents Control Real Phones
Agents can now control phones. Introducing Phone Harness (YC F26) Let your agent use your personal phone, or its own iPhone/Android in the cloud > Test and use real mobile apps > Message and call people > Grab verification codes for 2FA Open source. Connect through MCP, CLI, or API. Get started at
Context
Giving agents a real phone lets them test mobile apps, message people and fetch two factor codes, which opens up tasks that browser based agents cannot reach, and also raises new security questions.
Most AI agents today act in a browser or on a desktop, while many services live mainly in mobile apps. Phone Harness is a new Y Combinator startup, and its founder Shawn previously worked at Browser Use, which builds tools for agents that browse the web. MCP is a common standard for connecting agents to outside tools.
Deep dive
Shawn (@shawn_pana), founder of Phone Harness, posted on Nov 4 ET that agents can now control phones and introduced the company, which is part of Y Combinator's F26 batch.
According to the post, Phone Harness lets an agent use a person's own phone, or its own iPhone or Android device in the cloud. The listed uses are testing and using real mobile apps, messaging and calling people, and grabbing verification codes for two factor sign in.
The post says the project is open source and that agents can connect to it through MCP, a command line tool or an API. It links to the Phone Harness website and includes a demo video.
The post does not give pricing, the license, which phone models or operating system versions are supported, or how access to a personal phone is secured. Letting an agent read two factor codes means it can get into accounts protected by them, so how permissions are handled matters a lot, and that is not described in the post.
The launch passed 100,000 views by the time of this scan.
What to expect next
Watch for developers wiring Phone Harness into coding and testing agents, and for details on its license and security model. Mobile platforms such as Apple and Google may react to agents controlling phones through outside tools. Other agent tool makers could add phone control of their own. Early users will likely test how reliable it is on real apps. The founder's background at Browser Use suggests a focus on developer tools.