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For a Samsung Galaxy S5 on US Cellular (Model SM-G900R4), there isn't a single "app" titled US Cellular Diagnostics. Instead, you can access comprehensive diagnostic reports through built-in hardware menus and Samsung-specific tools. 1. Hardware Test Menu (General Diagnostics) This is the standard hidden menu used by technicians to verify hardware health. Access Code: Open your phone's dialer and type #0 # . Tests Included: Colors (Red, Green, Blue): Checks for dead pixels or screen burn-in. Vibration: Tests the internal vibration motor. Touch: Allows you to draw on a grid to find "dead zones" on the touchscreen. Sensors: Real-time data from the accelerometer, barometer, gyroscope, and proximity sensor. Speaker & Receiver: Plays audio tones to check for distortion. 2. Carrier-Specific "Diag Mode" (US Cellular) Specific to the US Cellular SM-G900R4 model, this code is often used for CDMA-level tool connections or advanced troubleshooting. Access Code: Open the dialer and type ##366633# . Purpose: Primarily enables "Diag Mode" for data programming and deeper system logging. 3. Modern App-Based Diagnostic (Samsung Members) If your S5 is running a newer version of Android (like Lollipop 5.0 or higher), you can use the official app for a more user-friendly interface. 12 sites How to Diag Mode Samsung SM-G900R4 Galaxy S5 US ... Sep 7, 2015 — galaxy s5 us cellular diagnostics tool
The Samsung Galaxy S5, particularly the U.S. Cellular variant (model number ), shipped with a built-in, hidden diagnostics suite. Unlike third-party benchmark apps, this tool was embedded within the device’s firmware for engineering, service center, and advanced user use. It provides direct access to hardware sensors, radio functions, and system tests that typical "Settings" menus hide. Tap Front Cam or Rear Cam