The call waiting feature on mobile phones means that users who are already using their handset for a conversation will be alerted, usually by a series of beeps, if there's another person trying to call them at the same time. We show you how to activate the function on an iPhone.
It's worth noting that not all smartphone owners will be able to access the call waiting feature. Some operators don't give the function to Pay-as-you-go customers, so if the option is greyed out, check with your network to see if you can have access to it.
From the Home screen select Settings.
Now open the Phone Menu. From here slide the button next to Call Waiting to on.
To de-activate Call Waiting at any time simply move the slider to the off position.