Keyboard problem during call
When I call my answering service for my landline from my iPhone, I'm asked to enter my number. I press the keyboard icon and the smaller keyboard comes up. I start entering the number and all goes fine until I have to enter the number 1. When I press on the 1 it doesn't enter and instead the screen goes black then comes back up then goes black. If I keep trying the 1 sometimes gets entered, but there is then an extra space in front of it and my number isn't recognized by the service.
Has anyone had a problem entering numbers on the little keyboard during a call? Is this a hardware problem that means I have to give my phone in for repair or get a new one or is it a software issue that can be fixed?
Any help is greatly apprecated.
Rex
iPhone 4S, iOS 5