When you want to tweak your iPhone’s preferences, you’ll usually open up the Settings app. That’s basic iOS 101. What you might not know is that there is actually another way to interact and change your device’s settings.
They’re called USSD codes, and they’re a communication protocol used by cellular telephones. But, in practical usage, they’re a way to tweak certain hidden settings and access secret features of your phone.
USSD codes harken back to a time before smartphones and touchscreen. Think your old, brick-like Nokia. As such, they’re entered via the Phone app in the same process as dialing a phone number.
Once the code is inputted, you can access, change or view the preferences of certain features or settings. Beyond just generally being a cool thing to know, they can even be useful.
Of course, you’ll want to be careful with some of these codes. Randomly entering some of these codes can negatively impact important settings that are pretty critical for your device. As a good rule, try not to go disabling things unless you know exactly what it is you’re turning off or on.
Use the Right Arrow to Browse 19 USSD Codes That Unlock Hidden Features in Your iPhone.