Lock Screen Dialer App Replaced with Microphone
I found the answer here:


  
  Go to Settings > Apps
  Click the Gear Icon (top-right of the UI)
  Click on Default Apps > Assist &amp; Voice Input > Assist app.
  Click "None" (the other option is Google App).
  
  
  This puts the dialer shortcut back on the lock screen, but it also disables long-pressing the home button to launch the Google App.