How to Fix Xiaomi Phone Mobile Data Not Working

Xiaomi phone hardware diagnostics can usually be checked through the built-in CIT test menu, sometimes labeled as the Xiaomi diagnostic menu. On HyperOS and MIUI devices, the menu opens from device information or dialer codes, then runs checks for display, touch, sensors, audio, vibration, charging, and other hardware parts without installing extra apps.

Steps

Open Settings > About phone > Detailed info and specs and tap Kernel version several times until the CIT test HyperOS or MIUI hardware test screen appears.
If the settings method does not work, try a supported dialer code such as *#*#6484#*#* in the Phone app to open the xiaomi diagnostic menu.
Review the test list and select the needed item, such as touchscreen, proximity sensor, speaker, microphone, accelerometer, battery, or charging.
Run either an individual test for one part or an automatic sequence if the device offers a full xiaomi hardware test mode.
Check the result status. A pass usually means the part responded normally. A fail or no response often points to hardware damage, blocked sensors, or a software-layer issue.

Option	Best For	Limitation
Settings entry	Normal access on most devices	Menu names vary by version
Dialer code	Fast opening of CIT menu	Some ROMs block the code
Single test	Checking one suspected part	Can miss wider device issues
Full test	General hardware screening	Takes longer and needs user input

Common Issues and Fixes

CIT menu does not open — likely cause: different ROM, disabled code, or carrier restrictions — fix: use the kernel version method first, then try the dialer code again.
Sensor test fails — likely cause: dirty sensor area, thick case, or screen protector misalignment — fix: clean the top bezel area and retest without accessories.
Touchscreen test misses points — likely cause: wet screen, glove mode conflict, or panel damage — fix: dry the screen, remove accessories, and repeat the touch grid test.
Speaker or mic test sounds wrong — likely cause: low volume, blocked grille, or app interference — fix: raise volume, clean ports carefully, close background apps, and rerun the audio test.
Battery or charging test looks abnormal — likely cause: third-party cable, overheating, or unstable power source — fix: use the original charger, let the phone cool down, and retest.

Quick Tips

Some HyperOS builds rename or relocate the CIT test HyperOS entry, but the kernel version shortcut still works on many models.
A passed test does not always rule out intermittent faults. Repeating the same test after restart can help confirm unstable hardware.
Regional ROMs, custom ROMs, and tablets may show different test names or fewer hardware items.
Factory reset is not required for the Xiaomi diagnostic menu, but software bugs can still affect test behavior.

🤔Note:

The CIT menu location and available tests can differ across HyperOS, MIUI, regional ROMs, and tablet builds, so some Xiaomi devices may show fewer options or slightly different names.

💡Protip:

If a test result seems inconsistent, restart the phone and rerun the same item with accessories removed. This is a quick way to separate temporary software behavior from a real hardware fault.

Is the Xiaomi CIT test safe to use?

Yes. The built-in menu is mainly for checking hardware response and usually does not modify user data.

What if Xiaomi hardware test shows failure but the phone still works?

An occasional fail can come from calibration, blocked sensors, or temporary software issues. Reboot the device, remove accessories, and run the same test again before assuming physical damage.

Try It Online Try It Online Try It Online Try It Online Try It Free Try It Free Try It Free Try It Free