How to Delete Calls on an iPhone
An iPhone is a multimedia phone you can use to perform a world of functions. By default, an iPhone keeps track of the calls you make, receive, and miss so that you can review them anytime you want. However, if you have not cleared your call history in a while, or if you want to maintain privacy, you can delete your call history easily.
Turn on your phone and tap the "Phone" icon on the lower left corner on your screen.
Tap the "Recents" icon and tap "Missed" if you want to view a list of the calls that you have missed. To remove all your missed calls, tap "Clear."
Tap the "All" button if you want to view all of your calls. This includes missed, received and outgoing calls. To delete all calls, tap "Clear."
Press the "Menu" button to return back to your iPhones main menu.