What the Samsung Secret Code Does
On supported Galaxy devices, dialing *#0*# in the Phone app opens a hardware diagnostic screen. From there you can launch checks for display colour, sensors, vibration, and touch input. For touch troubleshooting, the most relevant option is the TOUCH test.
Important
This menu is not available on every Samsung device. Some carrier versions disable it completely, even though the phone hardware itself is capable of the same tests.
How to Use the TOUCH Test
- Open the Samsung Phone app and dial
*#0*#. - When the engineering menu appears, tap TOUCH.
- Slide your finger across the screen to fill every grid segment.
- If one or more sections refuse to register, you likely have a confirmed dead zone or digitizer fault.
What a Failed Grid Segment Usually Means
If the same part of the grid never fills, that usually points to a physical problem rather than a software bug. In plain terms, the touch layer is not reporting input for that coordinate. The most common causes are impact damage, moisture, aging digitizer traces, or a poorly fitted replacement display.
| Result | Meaning | Next Step |
|---|---|---|
| Whole grid fills cleanly | Touch hardware is probably fine | Investigate software, settings, or app-specific lag |
| One strip or corner fails | Likely dead zone | Confirm with a browser-based grid test and consider repair |
| Code does not open anything | Carrier or firmware may block the menu | Use Samsung Members diagnostics or a browser-based alternative |
▶ Use a Universal Web Alternative
If your Samsung carrier blocks the secret code, you can still run a full grid-based touch test directly in the browser.
What If the Code Does Not Work?
Carrier-customized Galaxy phones sometimes disable engineering codes. That is common on devices sold through certain US carriers. If *#0*# does nothing, try Samsung Members and look for the Diagnostics section. If that is not available either, a browser-based test is your most universal fallback.
Browser-Based Alternative vs. Samsung Code
The hidden Samsung menu is convenient, but it is not essential. A web-based grid test can still reveal dead zones, missed swipes, and tap inconsistencies with enough accuracy for everyday troubleshooting. The advantage is that it works across devices, including Samsung phones where the code is disabled.