In my opinion in future everyone will communicate with phones. But they would be free. Humanity will go to the next level and they will create new sim card that are absolutely free. Another way can be with power of mind. Humanity will learn how to talk to person whenever he is with power of mind.  Another version can be with little things in brain that will allow everyone to communicate with thoughts. They will just think to call someone and that small thing in brain will call that person.  Also those little things in brain will allow us to see person that we are calling to.