What is *#0011 used for?

What Does *#0011 Do on Your Phone?

If you've ever punched in mysterious codes like *#0011 on your smartphone, you're not alone. This particular code is a hidden gateway to your phone's Service Mode, a behind-the-scenes diagnostic tool that reveals real-time network information. While not widely advertised, it's a favorite among tech-savvy users who want more control and insight into their device's connectivity.

When entered—usually as *#0011# to ensure proper execution—it can display key details like signal strength, current network type (3G, 4G, or 5G), and even allow you to force a specific network mode. This means you can manually restrict your phone to 4G, for example, which some users do to save battery or avoid spotty 5G coverage.

However, there's a catch: on many modern Samsung devices, this code no longer works. Samsung has disabled or restricted access to Service Mode on newer models, especially those running updated versions of Android. This is likely due to security and stability concerns—after all, tampering with network settings can lead to unintended consequences, from dropped connections to increased power consumption.

Still, if you're curious and your device supports it, trying *#0011# costs nothing. Just open your phone app, dial the code, and see what happens. If you're greeted with a screen full of technical data, you’ve accessed Service Mode. If nothing loads, your phone probably blocks it—common on recent firmware versions.

While not a feature meant for everyday users, *#0011# offers a rare peek under the hood. Just remember: with great power comes great responsibility. Tinkering can be fun, but it’s best to know what you're doing before making changes.