Device Guides
Apple iPhone 5
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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 remember 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 & Accept.
The new call is answered and the active call is put on hold.
Tap swap to swap calls.
Make sure the call you want to end is active.
Tap the end call icon.
The active call is ended and the call on hold is automatically activated.
Tap the end call icon.
Tap the Home key to return to the home screen.