Device Guides
Apple iPhone 4S
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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.

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Search in Apple iPhone 4S
How to
Making a call with hidden caller identification
Want to make a call without sending your own number (caller identification)? Follow these easy instructions.
Tap Phone.
Please note: this function only hides your number for the specific call.
Tap Keypad.
Key in #31# followed by the number you want to call.
Please note: this function only hides your number for the specific call.
Eg.: #31#123456789
Tap Call.
Please note: this function only hides your number for the specific call.