Phone app icon is missing from dock
My phone app icon has disappeared from the dock. It's not gone into any folder. I can find it using spotlight but holding doesn't make it jiggle so cannot put it back on the homescreen/dock. To make a call I have to search for it using spotlight every time. It's not in my purchased apps in the Appstore (presumably as it's a built-in app) nor is it available to re-download. Can anyone help please?
iPhone 6 Plus, iOS 8.1.2