End of call tone and transferring call tone
When a call is transferred, there is no way to tell if the person was transferred to you. You just have to blindly say "Hello???" and maybe someone is there or they aren't. It would also be useful to have a "called ended" tone. Sometimes the other person doesn't disconnect the call and there is no way of knowing if they are muted. You have to pull up the app to see that you are indeed still connected.