These publicly available backchannels allow users to directly communicate with their service provider's computers and/or access back-end features in their device. READ: 15 Cool Tricks You Didn't Know Your Phone's Camera Could Do This protocol was originally created for GSM phones (Opens in a new window), but can be found on CDMA devices (Opens in a new window) as well (if that's a bunch of acronym gibberish to you, here's a quick primer). Unstructured Supplementary Service Data (USSD)-sometimes known as "quick codes" or "feature codes"-is an extra-UI protocol, which allows people to access hidden features. secret pathways planted by programmers)? Well, that's actually a thing.Ĭoders have a storied tradition of baking in secret passageways (or sometimes, just fun little Easter eggs) that can only be accessed by inputting a special "key." And so that tradition continues in the mobile age. Remember that scene (Opens in a new window) in War Games when the socially broken code monkeys were explaining to aspiring hacker Matthew Broderick all about "back doors" (i.e. How to Set Up Two-Factor Authentication.
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