Unlock with these Hidden SmartPhone Secret Codes you might probably not have come across
Unlock with these Hidden SmartPhone Secret Codes you might probably not have come across 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. This protocol was originally created for GSM phones, but can be found on CDMA devices as well (if that's a bunch of acronym gibberish to you, here's a quick primer). The USSD protocol allows you to access hidden features you didn't know about right from your smartphone's dialer. But there is some trickiness you'll need to know about. Coders have a storied tradition of baking in secret passageways that can only be accessed by inputting a special "key." And so that tradition continues in the mobile age. These publicly available backchannels allow users to directly communicate with their service provider's computers and/or access back-end features in their device. They are acces...