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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How to
Turning caller identification on my mobile phone on or off
You can choose to make a call without sending your own number (caller identification). Follow these easy instructions to turn your own caller identification on or off.
Tap Settings.
Tap Phone.
Tap Show My Caller ID.
Tap the indicator next to Show My Caller ID.
Depending on the current setting, the function is turned on or off.
Please note: you can only hide your caller identification for voice calls. When you send an SMS, your phone number is always displayed.
Tap the Home key to return to standby mode.