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Inorder to write clean\good code you can follow simple principles.

To get the current phone number already connected to the call you need to use Call.Details#getHandle().

The common way when you faced with common constuctor params is to define multi constructors or setter and getters methods (JavaBeans).

There is a nice pattern to consider while develop. And that’s instead of having multiple constructors in the class and creating many instances of class to use, you should then consider the static-factory-method way.

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