Unlock hidden iPhone features with secret dialer codes that reveal tools, settings, and diagnostics Apple never shows in the menus.

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 ...

iPhones go through several quality control checks before they make it to market, and these checks apply to the final product as well as individual components. The iPhone's parts are sourced from ...