I feel like it's a fair assumption to say that the majority of us use - to speak into phones instead of "to phone." Considering that - is faster, and "to phone" doesn't work if you have more than one on you. But, when you speak softly into a phone with -, it doesn't leave a record of what you say on your end! Looking back over what you've said, you only get half of the conversation.
It would be nice if, when speaking softly into your phone with -, it left a log of what you've said on your end, rather than simply "You speak quietly into your phone..." This would make it easier to remember what you've said to the other party.