Android Secret Codes: Working Dialer Codes for Samsung, Pixel, Xiaomi, OnePlus, and More

Your Android phone can do far more than most people realize. Android secret codes are hidden inside the dialer, unlocking diagnostic menus, hardware tests, and system details you normally never see. They act as shortcuts, helping you access advanced information and tools in seconds instead of digging through layers of settings.

For example, checking battery health usually means hunting through menus and still coming up empty. With the right code, it opens instantly. Before diving into the list, it helps to know what these codes do, how they work, and what precautions to take if a code does not respond on your device, or worse, does something you were not expecting.

What Are Android Secret Codes?

Android secret codes were originally created for manufacturers and service technicians. They used them during production and repairs to test components quickly. Instead of connecting a phone to diagnostic software, they could type a short code in the dialer and instantly see results.

Over time, these codes became publicly known, and that is why regular users can now access powerful diagnostic menus too.

These codes give direct access to different parts of your phone’s system. Think of them as shortcuts that reveal hidden information or trigger internal actions that are otherwise buried inside Android’s structure.

Some codes are universal and safe to use, while others are brand-specific or intended for technicians. That is why it is important to understand how Android secret codes work before experimenting with them.

How Android Secret Codes Work

When you enter a code in your phone’s dialer, you are speaking to Android in its native language, a numeric command system. Just like typing a query in Google and getting an instant result, the Android OS scans its internal command list for that exact pattern.

If it finds a match, it executes the linked action immediately. That could be showing your battery stats, IMEI number, or even triggering a factory reset.

That is why these codes are both powerful and sensitive. You are accessing the same backend commands used by service engineers.

Worth knowing before you start: newer Android versions have quietly disabled some of the most commonly cited codes for security reasons. The engineering menu code, *#*#4636#*#*, is one of the most affected. It has been disabled on most One UI 6 and later Samsung phones, and on many Android 12 and later devices generally, though results vary by manufacturer and firmware.

If a code in this list does not respond on your phone, that is often the reason, not a typo on your end.

Safety and Precautions Before Using Android Secret Codes

While many codes are completely safe, others can erase data or change internal configurations. Before trying any, make sure you follow these essential safety tips.

1. Understand the purpose of each code before using it. Every Android secret code is designed for a specific purpose. Some are safe and only display information, while others can reset your phone or change its internal settings. Always check what a code does before entering it into your dialer.
2. Always create a backup first. If you are going to use a code that can reset your device, a small mistake can remove all your data. Before trying such a code, always back up your important information.
3. Use only verified codes. Never rely on random social media posts for secret codes. Some codes may be fake or harmful. Use only trusted tech sites or official brand forums for verified codes.
4. Be very careful with reset or firmware commands. Codes like *#*#7780#*#* or *2767*3855# can wipe your phone without asking for confirmation. Do not use them unless you are certain of what you are doing.
5. Turn off mobile data or Wi-Fi before using unknown codes. Some older codes send signals through your mobile network. To stay safe, turn on airplane mode or turn off data before entering any code you have not used before.

How to Use Android Secret Codes

Using Android secret codes is simple once you know the process.

1. Open your phone’s default dialer app (avoid third-party dialers).
2. Type the secret code exactly as provided below.
3. Wait for a few seconds for it to run automatically. If it doesn’t, press the call button.
4. Follow on-screen instructions if a diagnostic menu appears.
5. If a warning or reset option appears, stop immediately unless you are sure.
6. Exit the menu and return to the home screen once done.

Best Secret Codes for Android

Here is an organized list of Android secret codes, grouped by category so you can quickly find what you need, whether it is testing your sensors, viewing system info, or accessing your brand’s hidden service menu.

Note: if a code fails to respond, do not repeat random combinations, and do not assume it is broken. Manufacturer restrictions and Android security updates are the most common reasons a previously working code stops responding.

Codes for Testing and Device Information

These codes are for checking what is inside your phone, its hardware parts, and firmware details. They do not change anything on your device. They only show information that stays hidden.

These codes are for checking what is inside your phone, its hardware parts, and firmware details. They do not change anything on your device. They only show information that stays hidden.

Codes for Managing System and Settings

These codes unlock hidden menus for managing system settings, letting you adjust power-button actions, run diagnostics, switch network bands, and check battery health.

Factory Reset and Firmware Codes

Here is where you need to be careful. These codes can reset your device or reinstall its firmware completely. They are used by service centers when a phone starts acting up or needs a clean reinstall. Back up your data before running any of them.

Connectivity, Network, and Wireless Codes

If your phone’s Wi-Fi, Bluetooth, or GPS is not working right, this is your go-to list. These codes let you test wireless connections, measure signal strength, and check GPS locks.

Troubleshooting and Diagnostic Test Codes

Here you will find codes that check sensors, speakers, vibration, display, and other key hardware parts. When something stops working, like your screen not responding properly or sound crackling, these tests help you figure out if it is a software issue or a real hardware fault.

Call, Message, and Network Settings

These codes deal with your phone’s basic communication features like calls, texts, and network functions.

Developer and Debug Tools

Developer and debug codes reveal advanced menus that engineers and testers often use. They let you view logs, open system dumps, or adjust modem settings.

Brand-Specific Secret Codes

Every smartphone brand hides its own set of special codes. Samsung, OnePlus, Xiaomi, Motorola, and many others have unique diagnostic menus that general Android codes cannot open.

Note: brand codes vary by region and model. For each brand, verify on your exact model, since a code confirmed on one device may not work identically on another.

Samsung

One Samsung-specific note worth flagging: the default Samsung dialer blocks *#*#4636#*#* on many current models. If that code does not respond, installing and setting the Google Phone app as your default dialer, then trying again from there, is a common workaround.

Motorola

Xiaomi / Redmi

OnePlus

Huawei / Honor

Oppo / Realme / Vivo

Google Pixel

Backup and Utility Codes

These codes help you back up files, check calendar data, or open media-copy menus. They are small but useful when you are setting up, cleaning, or transferring data from one phone to another.

Related: Adaptive Battery vs Adaptive Power: How Android and iPhone Save Energy

Fix Android Secret Codes Not Working

If you are typing the right code but nothing happens, it could be due to software restrictions, carrier limitations, or disabled service menus. Here is what to do.

1. Restart your phone, or toggle Airplane mode on and off.
2. Certain codes, those related to the network or carrier, will not work if your SIM card is inactive or has a poor signal. Make sure your SIM is inserted and active.
3. Clear the Phone app’s cache and data. Go to Settings, then Apps, then find Phone, then tap Storage, then Clear Cache and Clear Data. Then try again.
4. Update your system software. Newer Android versions have disabled certain diagnostic codes for security, most notably *#*#4636#*#* on many devices, so this is worth checking before assuming a code is broken.
5. Boot your phone into Safe Mode and test the code again. If it works there, a third-party app is likely blocking your code. Uninstall any suspicious apps afterward.

Final Thoughts

Android secret codes are like cheat codes for your phone. They are powerful shortcuts that reveal what is happening behind the scenes. Whether you are checking your battery health, verifying your IMEI, or testing your sensors, these hidden codes can save you a lot of time, and many of them still work reliably across current Android versions.

Just remember to be cautious and always double-check what a code does before running it. Some of the codes in this list, particularly *#*#4636#*#*, have been restricted or disabled on newer devices for security reasons, so do not be surprised if a few do not respond the way older guides describe. When used wisely, the ones that still work turn your regular smartphone into a professional-grade diagnostic tool without needing any extra apps.