How to Mount Your Smartphone on a Steam Controller – And Why It’s Limited

Valve’s discontinued Steam Controller has a hidden feature: it can physically mount a smartphone using its clip-on attachment. While this setup may seem like a clever workaround for mobile gaming, its practical use is severely limited by software compatibility.

According to a Reddit user named “SolderedTheSun”, who shared a video demonstration in June 2024, the Steam Controller’s clamp can securely hold a smartphone in place. However, the device’s Steam Input system does not support most iOS or Android applications, restricting functionality to Steam-compatible games and software.

This limitation means users cannot run popular mobile apps like Netflix, Spotify, or mobile games through the Steam Controller’s interface. Instead, the smartphone essentially functions as a secondary display or input device, depending on the Steam Input configuration.

How the Smartphone Mount Works

The Steam Controller’s clip is designed to attach to the back of the device, allowing users to position their phone for better ergonomics or additional screen space. The setup involves:

• Attaching the Steam Controller clip to the smartphone.
• Connecting the Steam Controller to a PC via Bluetooth or USB.
• Configuring the smartphone as an input device or secondary display in Steam Input.

While this method may appeal to enthusiasts experimenting with unconventional setups, it does not transform the Steam Controller into a fully functional mobile gaming device.

Why Compatibility Is So Limited

The primary issue lies in how Steam Input interacts with mobile applications. Unlike traditional PC games, most iOS and Android apps are not designed to recognize external controllers or display outputs. This means:

• Mobile apps do not natively support Steam Controller inputs.
• The smartphone’s screen remains inactive unless used as a secondary display for Steam games.
• Touch controls on the phone are not recognized by non-Steam applications.

Valve has not provided official documentation or updates regarding smartphone compatibility, suggesting this feature was either experimental or intended for niche use cases.

Is There a Practical Use for This Setup?

For most users, the Steam Controller’s smartphone mount is more of a novelty than a practical solution. Potential use cases include:

• Using the phone as a secondary display for Steam games with controller support.
• Experimenting with custom controller configurations for specific applications.
• Repurposing the Steam Controller as a makeshift phone stand with limited input functionality.

However, without broader app support, the feature remains largely impractical for everyday use.

What’s Next for Steam Controller Users?

Since Valve discontinued the Steam Controller in November 2019, official support and updates have ceased. Users interested in similar functionality may need to explore alternative controllers or third-party solutions, such as:

• Xbox or PlayStation controllers with smartphone mounts.
• Mobile gaming accessories like the Razer Kishi or Backbone One.
• Custom controller mods or DIY solutions for enhanced compatibility.

“The Steam Controller’s smartphone mount is a clever trick, but it’s not a game-changer. Without app support, it’s mostly just a fun experiment.” — SolderedTheSun, Reddit (June 2024)

For now, users looking to integrate smartphones with gaming controllers may find better results with dedicated mobile gaming accessories rather than repurposing older hardware.