How to use secret USSD codes to unlock hidden iPhone settings

A quick guide to use secret USSD codes for unlocking hidden iPhone settings.

Smartphones have evolved a long way since the advent of feature phones into this world and such an evolution has transformed the way we could unlock hidden settings of a phone or an iPhone in a jiffy. The hidden iPhone settings could often hold the key to simple status displays to something more complex like improving the phone's voice quality or as eerie as hiding your number on the recipient's handset.

Note: IBTimes SG reminds its readers that the information provided in this article is for reference only. The publication will not be held liable for any damage caused to the device during or after using these USSD codes, and hence users are advised to proceed at their own risk.

Regardless of your diversified needs and intentions, here are a bunch of USSD codes that can be entered into your handset using a handful of digits, characters and a simple tap on the call button:

[Source: Redmond Pie]