my voice over is not saying anymore what is appearing on my screen.

Hello, My father is blind and is using his iphone with voice over all the time. SInce yesterday, the voice over is not saying anymore what is on his screen appearing.

We can turn on voice over, and use siri to help out to ask for the time and a date for example, but normally when he turns his iphone off and on, it automatically says what is on his screen appearing.

So when you switch it off and on, it comes on the home screen and he is telling with voice over what that time it is. It also says with applications are on the screen, but now not anymore

Now this is not working anymore.

I have been looking into the voice over menu, but could not find anything on how to turn it on again.

I restarted the whole phone 2 times, but still when I turn on voice over, it stays silent.

The phone mute is not on, and the volume is high.

Is their somebody who can help us?

Thanks.

ROnald