[Guardian]

On mine and I am sure others, when you have a missed call, it shows an icon on the top left of the home screen and the right quick button becomes call history. This is a one time change when you have last missed a call and have not yet used your phone for anything.

you can also get to it through the start menu or put a shortcut to it on your home screen shortcuts like I have but as already suggested the easiest is to press the send button and the ones with a green you answered or made successful connection with, the ones with red exclamation are the ones you missed or couldn't get through and the ones with the yellow means they left a message for you.