If you have an important call waiting, it may be a good idea to enable the Call waiting function so that you can tell the phone is ringing even if you're on another call. In this guide we'll be looking at how to enable the Call waiting function on your iPhone.
This is what you do:
1. Press Settings.
2. Press Phone.
3. Under Calls, press Call Waiting.
4. Press the grey button next to OFF to change it to ON.
We've now looked at how to enable the Call waiting function.