1. A method, comprising: at a portable electronic device with a touch screen display: displaying a list of voicemail messages; detecting selection by a user of a respective voicemail message in the list; responding to the user selection of the respective voicemail message by initiating playback of the user-selected voicemail message; detecting a finger contact with a progress bar on the touch screen display, the progress bar configured to slide in a first direction on the touch screen display; detecting continuous movement of the finger contact on the touch screen display from the progress bar to a location other than the progress bar, wherein the continuous movement of the finger contact on the touch screen display has a component parallel to the first direction and a component perpendicular to the first direction; in response to the detected continuous movement, sliding the progress bar in accordance with the component of the movement of the finger contact that is parallel to the first direction; and restarting playback of the user-selected voicemail message at a position within the user-selected voicemail message corresponding to the position of the slid progress bar.