I have seen several ways to "make sure that my app is shown again after a phone call which my app has initiated has ended" however that isn't what I want -> what I am looking for is a way to, say my app is currently running in the background doing network communications and someone calls me, I would like my app to either be able to "detect when the phone call has ended and resume my network communications" and/or "launch/resume my app back into the foreground when the phone call has ended". Is there any way to accomplish something like this and how?
This is unsupported within iOS.
If your application is active when a call event takes place, the system dispatches the event to your handler immediately. However, call events can also take place while your application is suspended. While it is suspended, your application does not receive call events. When your application resumes the active state, it receives a single call event for each call that changed state—no matter how many state changes the call experienced while your application was suspended. The single call event sent to your handler, upon your application returning to the active state, describes the call’s state at that time.
The best you can do is detect phone calls while your app is open.