FaceTime not letting me accept phone call
Hi, I bought my Mum a new 6s iPhone. It is running the latest software. When I went to show her how to use FaceTime (I called her from my phone using video call), she could not accept the call. The accept button was merged with the reject button and so when she pressed accept, it immediately ended the call upon answering. This didn't happen when I did a simple FaceTime audio call. So far I haven't been able to find why this happening.
I've attached a screen shot of the call.