How to make Truecaller your default dialer

In order to set Truecaller as your default dialer you need to enable "Missed call notifications" by doing the following: 

• Open Truecaller and tap on the Menu .
• Settings .
• General  > Scroll down to 'Missed call notification' and enable it. Once that is done you'll be asked to "Allow notification access", enable it and you're all set. 
  
  
• (See video)

You can also allow Notification access within your Phone settings > Apps > Truecaller > Notifications. 

Note that Truecaller does not replace the call screen which appears after you initiate a call where you can enable the Speaker or create a Conference call.