Our Android devices hold a large amount of information about the hardware and system that an average user might find difficult to access. But if you know the secret codes that Android uses to bring up this information, you can find out all sorts of hidden stuff about your device. For example, if the IMEI number – used to uniquely identify your device and block its use if stolen - has rubbed off the back of your phone and it isn't printed inside the battery cover, a simple button combination can bring it up on screen.
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