Why it is hard to call Talk Radio Shows on an Iphone

I just accidentally hung up on Charlie while on the air. Oops

The problem is for sound quality they want you to talk in the actual phone not on your ear buds or a blue tooth head set. Problem you cannot not lock the the screen of an Iphone when talking through the hand held speakers(It will hang up if you try to). So if you press it against your face too hard it hangs up

Sorry Charlie I was not being rude :)

Chris