Samsung mic test code and other phone hardware test codes

The codes at a glance

Codes vary by model, carrier, region and software version. A code that works on one Galaxy can do nothing on another. We mark each one as official (documented on the maker’s own support site) or community (widely reported by users and repair guides, not documented by the maker).

• Samsung Galaxy: dial *#0*# for the hardware test menu. Official: Samsung’s own support pages describe opening test mode with this code.
• Samsung Galaxy, no code: Samsung Members app → Diagnostics, including a two-microphone test. Official.
• Google Pixel: dial *#*#7287#*#* to open the Pixel Repair Diagnostics app (Pixel 3 and later, needs internet, English only). Official.
• iPhone: no dialer test code. iPhone 14 and later have a Diagnostics Mode with an audio test. Official.
• Xiaomi, Redmi, POCO: dial *#*#6484#*#* for the CIT hardware test menu. Community: we found no Xiaomi help page for it.
• Motorola: the Device Help app → Device Diagnosis → Hardware Test. Given by Motorola support staff in Lenovo’s community forum.
• OnePlus: *#808# opened a test menu on older models. Community, may not work on current phones.

Be careful with long "secret codes" lists online: only dial codes from the maker or from this list. Some service codes change settings, and none of them unlock hidden features.

How to open the Samsung test menu

1. Open Samsung’s Phone app and tap the keypad.
2. Dial *#0*#. You do not press call: the test menu opens as soon as the last character is typed.
3. A grid of buttons appears. Tap one to run that test, and press Back to return to the grid.
4. When you are done, press Back until the menu closes.

Nothing happens? Samsung’s support says to turn off Auto Blocker: open Settings → Security and privacy → Auto Blocker and switch it off, then dial the code again. Remember to switch it back on afterwards. Carrier-branded phones (some US models in particular) may block the menu entirely. The code also only works in Samsung’s own Phone app, not in a third-party dialer.

Button names differ by model, but users commonly report tiles such as Red, Green, Blue and Black (screen), Receiver (earpiece), Speaker, Vibration, Touch, Sensor and the camera tests. Samsung’s own page names only one of them, the main camera test (MEGA CAM), so treat the rest as community information.

Samsung mic test in the test menu

This is the part people search for as "samsung mic test code". The menu has no single "Mic" tile on most models. Instead:

• Receiver plays a tone through the earpiece at the top: it tests what you hear on calls, not the mic.
• Speaker plays sound through the loudspeaker.
• Many models have a loopback test that sends the mic straight to the earpiece, for example an entry called RCV DualMic. Speak into the bottom mic, then the top one: you should hear yourself in each. This comes from repair-community reports; the exact tile name varies.

If you hear yourself through one mic but not the other, that microphone or its opening is likely blocked or faulty. A phone has a call mic at the bottom and a noise-cancelling mic at the top, which is why calls can sound fine while video recordings sound muffled, or the other way round.

Samsung Members diagnostics: the official mic test

No code needed, and Samsung documents every step. The app comes preinstalled on most Galaxy phones.

1. Open Samsung Members.
2. Go to the Get help tab (on some versions it is Support) and tap Diagnostics (or View tests).
3. Tap Mic, or Test all to run everything.
4. Allow recording if asked. Tap Record, say something, then tap Play.
5. Answer Yes if you heard yourself, No if not. Repeat for the second microphone.

Samsung’s reading of the result: if you hear both recordings, the microphones work and your problem is software, for example an app permission. Then check Settings → Privacy → Microphone access, try Safe mode to rule out a third-party app, and disconnect Bluetooth headsets that may be taking the call audio. Samsung notes menu names vary by model and software version.

Pixel, iPhone and other phones

Google Pixel

Dial *#*#7287#*#* in the Phone app while online to open Pixel Repair Diagnostics and follow the prompts. For the mic, Google’s own advice is simpler: record a clip in the Recorder app and play it back. If you hear it, the bottom microphone works.

iPhone

There is no "iphone mic test code". Apple suggests recording a Voice Memo and playing it back, then recording a short video with the front camera and another with the back camera, since each uses different microphones. On iPhone 14 and later you can run Diagnostics Mode: turn the iPhone off, press and hold the side button as it starts up to open Recovery Assistant, and tap Diagnostics Mode (Wi-Fi required). Its Audio test plays tones and records a short clip on each microphone; the recordings are deleted afterwards.

Xiaomi, Redmi and POCO

Dial *#*#6484#*#* to open CIT, which lists tests for the screen, sensors, speakers and microphones. Some models use *#*#64663#*#* instead, and users also report reaching CIT by tapping Kernel version several times under About phone. None of this is documented by Xiaomi, so it may differ on your model.

Other Android phones

Look for the maker’s own app first: Motorola’s Device Help, or the diagnostics in Settings on some models. Android has no universal test code.

Test the mic in your browser instead

Codes are hit-and-miss across models. Our mic test works the same on any phone with a current browser: tap Start microphone test, allow the microphone and speak. You see your level in dBFS, a waveform, and you can Record 5 s and play it back. The recording stays in the tab’s memory and is gone when you reload; nothing is uploaded.

It cannot pick which of the phone’s mics to use (the phone decides), but it answers the main question in ten seconds: does sound get through? The results guide explains the numbers.

If the browser test hears you but an app does not, it is a permission or app setting: see Android microphone not working or iPhone microphone not working. For calls on a computer, read mic and camera in Zoom, Teams and Discord.