When you do not wish to receive any calls press the call options icon on the home screen then press enable do not disturb. When the Do Not Disturb feature is on a notification is displayed in the top right hand corner of your home screen. Your contacts will now see your status as “busy” and will not be able to call you directly.
To turn do not disturb off simply press the notification. Your status will now be set back to available and you’ll be able to receive calls again.