title: Call a method in android system app
body: <p>I am developing an android application where I want to call a method in android system app(Phone app) to access some of the features. I checked few examples to understand how method calling is happening within system apps. We need to import the package and then create a instance of the class to access specific methods.</p>
  
  <p>But when I use the same way, it says "Package can't be resolved".</p>
  
  <p>My question is can we access methods in android system app? If so what is the best way of doing it?</p>