How to Hide Recent Contacts from the iPhone App Switcher
 

iOS8 adds a new quick contacts feature to the app switcher (you know, the view when you double-press the Home button) but not everybody is thrilled with it. If you want to hide your frequent contacts from this view, you can do it easily in the settings.

http://www.howtogeek.com/197247/how-...-app-switcher/