Device Guides
Apple iPhone 4
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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
Using call waiting on my mobile phone
Want to answer an incoming call during an ongoing call? It's called call waiting. It's easy, but first you need to turn on call waiting before you can use this function.
When you have an ongoing call, the new call is indicated by a sound signal and a call waiting menu is displayed.
Tap Hold Call + Answer.
The active call is put on hold and the other call is answered.
Tap Swap to swap calls.
Your calls are displayed on a list and the call on hold is indicated by HOLD.
Make sure the call you want to end is active.
Tap End.
The active call is ended and the call on hold is automatically activated.
Tap the Home key to return to standby mode.