By entering certain strings of numbers and symbols into your phone's dialer, you can gain access to a world of hidden ...

Unstructured Supplementary Service Data (USSD) codes are strings of characters primarily used by developers and technicians to troubleshoot smartphones. You can use these codes to learn more about ...

The Settings app is great, but it’s not the only way to change your iPhone’s options and functionality. Those who want to dig deeper into the system can take advantage of iPhone secret codes, ...

Coders have a storied tradition of creating back doors in programs (or sometimes just fun little Easter eggs) that can only be accessed with a special "key." This has happened for almost as long as ...