Lost my M2 phone app and contact list... how do I restore it?

[AC Question]

I accidentally deleted a contact list which deleted my phone as well.

 

[B. Diddy]

Welcome to Android Central! Do you mean the shortcut is gone from the homescreen, or is no longer visible in the App Drawer? If your phone isn't rooted, you can't delete the Phone app, since it's a system app.