Have you ever wondered if your Android phone is working properly across all components? Whether you're noticing occasional issues, are selling your device, or are considering buying a secondhand one, performing a complete hardware diagnostic is a fundamental task that can save you trouble, money, and time.
In this article, we'll explain how to perform a diagnostic test on your Android phone step by step. We'll review everything from secret codes to the most comprehensive apps to check the status of all your device's components. We'll also cover professional tools for businesses and home users who want to ensure a device is in perfect condition.
What is an Android diagnostic test and why should you run one?
An diagnostic test On Android, it's used to check the status of the phone's components and ensure that the hardware and software are working properly. It's like a medical checkup for your phone: it examines the speaker, microphone, battery, GPS, sensors, screen, connectivity, cameras... everything.
This type of testing is especially useful if you are going to buy or sell a used mobile phoneKnowing if a device has any hidden flaws can make the difference between a good purchase and disappointment. It also helps if you notice performance issues or think something's wrong, but you don't know what.
How to access diagnostic functions from Android itself
Many Android devices have secret codes These codes allow you to access hidden menus from your phone's dialer. These codes vary depending on the make and model, but some of the most common are:
- * # * # * # * # 4636: Displays network usage and status information.
- * # 0 * #: Access hardware tests on some Samsung devices.
- * # * # * # * # 6484: Detailed diagnostic menu on Xiaomi models.
- * # * # * # * # 64663: also used in POCO, Redmi or Xiaomi mobiles.
To use them, simply Open the phone app, enter the code as if you were going to call, and wait.In many cases, a menu will open where you can test components such as the display, sensors, GPS, speakers, microphone, and more.
Diagnostics through integrated tools according to the brand
In addition to the codes, many manufacturers include pre-installed applications for diagnostics without having to type special combinations. Here are some examples:
Samsung
On Galaxy models, you can dial * # 0 * # and access a menu with touch, color, sensor tests, etc. If it doesn't work, it may be because your operator has blocked it.
Motorola
Use the app Device Help, which comes pre-installed. From there, access Device diagnostics and choose individual tests or a complete hardware diagnosis.
Huawei
Find the hidden app HwMMITest. To activate it, go to Settings → Apps → Show system apps and locate it. You may need a 55% to 80% charged battery and a reboot in special mode.
Google Pixel
They do not include a built-in tool. You can try with * # * # * # * # 4636 or look for solutions within the Pixel community itself. Another reliable alternative is to use an external app or tools like Phonecheck.
Specialized applications for hardware diagnostics on Android
If you don't want to bother with codes or your phone doesn't include built-in tools, there are third-party applications Very useful for analyzing your phone's status. These apps typically offer comprehensive tests, detailed reports, and recommendations.
TestME
An easy-to-use app that analyzes six areas of the device: display, sound, motion, connectivity, hardware and cameraYou can run quick or full tests (up to 19 tests) and follow simple instructions like pressing buttons, moving your hand closer, or activating Bluetooth.
Phone Doctor Plus
Provides automated testing for more than 30 components of the phoneThese include sensors, GPS, CPU, gyroscope, camera, audio, and more. It also includes features to optimize battery and memory.
Dr.Fone Phone Check
In addition to managing data, this tool performs hardware check: battery, temperature, capacity, RAM, storage… useful for detecting problems and recovering performance.
AIDA64 and Droid Hardware Info
Both offer detailed technical reports of all internal elements: system, RAM, CPU, network, battery, sensors, etc. Although they do not perform active tests, they are ideal for knowing your hardware in detail.
3DMark and PCMark
Focused on evaluating CPU and GPU performanceThey display comparative scores and allow you to analyze how well your phone performs in real-world tasks or demanding games.
Professional diagnostic software and device certification
For companies, technicians or those who sell second-hand phones, a comprehensive solution such as Phonecheck can be a great advantage. This software offers a automated diagnosis of up to 80 points, detects non-original components, check IMEI, unlocks, usage history and more.
In addition, it generates certified reports in PDF or in the cloud, allowing the buyer to be shown that the device is in perfect condition. This can strengthen customer confidence and facilitate a more secure sale.
- Complete hardware and software testing (sensory, battery, connectivity…)
- Detection of non-OEM parts and if the mobile phone has been tampered with or repaired.
- Full device history: warranty, production date, locks, IMEI, etc.
- Integration with MDM tools and secure data erase options.
Most common problems detected in diagnostics
Tests often reveal errors that are not readily apparent. Some typical errors include:
- Degraded batteries, poorly calibrated or with low load capacity.
- Faulty microphones, speakers or vibrations.
- Touchscreen failures, dead zones or damaged pixels.
- Sensors disconnected or that respond erratically (proximity, gyroscope, etc.)
- Wi-Fi, Bluetooth, or GPS connection errors.
How to choose good diagnostic software?
If you're using a more advanced app or software, make sure it meets these conditions:
- Complete tests for Android (and optionally iOS).
- Reliability and precision in the reports.
- Automation to run tests on multiple devices at once.
- Integration with other systems (MDM, reports, data deletion…)
In this sense, Phonecheck has proven to work very well for both professional and personal use. Its use in sectors such as the online sale of refurbished mobile phones demonstrates the value it can bring.
Also, if you are going to buy a mobile phone on platforms like Wallapop or Milanuncios, you can ask the seller for a video showing the diagnosis using these codes or an app like TestM. This way, you'll be able to check if the phone delivers what it promises.
There's nothing more frustrating than buying a used phone that only works for two days. Diagnostic tools have become a buyer's best friend and an essential resource for any serious seller. From simple apps like TestM to professional suites like Phonecheck, reliable diagnostics can make the difference between a safe investment and a bad experience. Share this guide so other users can diagnose hardware on Android.
