Device Guides
Apple iPhone 5c
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

Search in Apple iPhone 5c
How to
Making a call with hidden caller identification
You can make a call with hidden caller identification, your number will then not be shown at the receiving end. You can also turn off your own caller identification for all calls.
Tap Phone.
Tap Keypad.
Key in #31# followed by the number you want to call.
Eg.: #31#123456789
Tap Call.