Duper

Android app to find your phone remotely via SMS commands.

Why "Duper"? It's French verlan (slang made by reversing syllables) for perdu → du-per. Perdu means "lost" in French. You get it.

Features

• Remote Ring – Trigger alarm and LED flash at max volume
• Remote Locate – Get GPS coordinates via SMS
• SMS-Based – No internet required on target device
• Customizable – Set your own command prefix and password
• Auto-GPS – Optionally enable location services automatically (requires ADB setup)

Quick Start

1. Download latest APK from Releases
2. Install and grant SMS/Location permissions
3. From another phone, send: <prefix> ring [password] or <prefix> locate [password]

Commands

Command	Action
<prefix> ring [password]	Triggers alarm
<prefix> locate [password]	Sends GPS coordinates via SMS

Permissions

• SMS – Receive commands, send responses
• Location – GPS tracking
• Camera/Flashlight – Visual alert
• Background Location – Track when app is closed (optional but recommended)

⚠️ Android 15+ Note

Android 15+ blocks SMS permissions by default.

If the SMS toggle is greyed out:

1. Go to Settings > Apps > Duper.
2. Tap the three-dot menu (⋮) in the top-right corner. (Note: On some devices, you may need to tap "Permissions" first to see this menu).
3. Select Allow restricted settings.
4. Return to Permissions and grant SMS access.

Auto-Enable GPS (Optional)

If your phone's location services are turned off, the locate command will fail by default. Duper can automatically enable location services if you grant it a special permission via the Android Debug Bridge (ADB).

adb shell pm grant fr.sudotiz.duper android.permission.WRITE_SECURE_SETTINGS

Requires USB debugging enabled. One-time setup.

License

GPL-3.0 – See LICENSE