When you receive a message while you are on a call, a notification banner slides down into view, replacing the status bar.
In this example, while Josh McNab is in a call with Hannah Smith, he receives a message from Jen McMaster. He navigates to the message and responds to the message.
You are navigated from the in-call screen to the message screen.
The keypad appears in landscape mode.
The message response is sent.
You are navigated to the Call Screen.