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Android hidden codes: All the custom dialer codes and what they do
Access a plethora of secret service menus and other useful options in your Android phone.
Google has numerous hidden features inside its Android OS. Besides the venerable Android version-specific Easter eggs, it is also possible to utilize custom dialer codes to access a plethora of apps and settings that are otherwise unreachable for regular users. Some of these codes are universal, which means you'll get the desired output on any device, whether it's a cheap budget phone or one of the best Android phones. Having said that, custom OEM skins (like One UI by Samsung and MIUI by Xiaomi) and carrier-customized models often come with their own set of hidden codes.
How to Access the Hidden Hardware Diagnostic Tools on your Android Phone
Your Android smartphone likely has a pre-installed, but hidden hardware diagnostic tool. Here's what it does, and some possible ways to find it.
If you're buying a phone secondhand, the first thing you should absolutely do is complete a thorough check of the device's hardware to ensure that everything is working as intended. So you pop in your SIM card, head on over to the Play Store, and download one of the many hardware diagnostic testing apps available for free. But there's no need to install any third-party app, for within most Android smartphones you'll find a hidden hardware diagnostic app.