The in-call status bar doesn't show when activated in the simulator.
My app has the regular status bar always hidden, is this normal behaviour?
Is my app going to be rejected if the in-call status bar doesn't show at all?
No it won't be rejected. If you hide status bar it will also hide the in-call status bar. You have the option to hide status bar and this option also disables in-call status bar so you don't have to worry. You can hide the status bar without giving explanation to anyone!