A method for invoking a digital assistant, performed by a portable electronic device that includes a portable-device display and is in communication with a vehicle display of a vehicle, comprising: at the portable electronic device: displaying a first user interface on the portable-device display; displaying, via the vehicle display of the vehicle, a second user interface, the second user interface including an affordance, wherein the second user interface is visually distinct from the first user interface; while the second user interface is displayed on the vehicle display of the vehicle, detecting an input activating the affordance in the second user interface, and in response to detecting the input activating the affordance displayed within the second user interface on the vehicle display of the vehicle, invoking a digital assistant at the portable electronic device; in response to invoking the digital assistant, prompting a user for an audible request; in response to receiving the audible request at the portable electronic device, wherein the audible request comprises a search query, displaying, via the vehicle display, within the second user interface a digital assistant dialogue box; and subsequently: displaying, via the vehicle display, within the second user interface a user interface object associated with a search result of the search query; and maintaining the first user interface on the portable-device display; receiving a touch input at the first user interface on the portable-device display; and in response to receiving the touch input at the first user interface on the portable-device display: updating a visual appearance of the first user interface on the portable-device display; and maintaining the second user interface on the vehicle display of the vehicle. at the portable electronic device: displaying a first user interface on the portable-device display; displaying, via the vehicle display of the vehicle, a second user interface, the second user interface including an affordance, wherein the second user interface is visually distinct from the first user interface; while the second user interface is displayed on the vehicle display of the vehicle, detecting an input activating the affordance in the second user interface, and in response to detecting the input activating the affordance displayed within the second user interface on the vehicle display of the vehicle, invoking a digital assistant at the portable electronic device; in response to invoking the digital assistant, prompting a user for an audible request; in response to receiving the audible request at the portable electronic device, displaying a first user interface on the portable-device display; displaying, via the vehicle display of the vehicle, a second user interface, the second user interface including an affordance, wherein the second user interface is visually distinct from the first user interface; while the second user interface is displayed on the vehicle display of the vehicle, detecting an input activating the affordance in the second user interface, and in response to detecting the input activating the affordance displayed within the second user interface on the vehicle display of the vehicle, invoking a digital assistant at the portable electronic device; in response to invoking the digital assistant, prompting a user for an audible request; in response to receiving the audible request at the portable electronic device, wherein the audible request comprises a search query, displaying, via the vehicle display, within the second user interface a digital assistant dialogue box; and subsequently: displaying, via the vehicle display, within the second user interface a user interface object associated with a search result of the search query; and maintaining the first user interface on the portable-device display; receiving a touch input at the first user interface on the portable-device display; and in response to receiving the touch input at the first user interface on the portable-device display: updating a visual appearance of the first user interface on the portable-device display; and maintaining the second user interface on the vehicle display of the vehicle. displaying, via the vehicle display, within the second user interface a user interface object associated with a search result of the search query; and maintaining the first user interface on the portable-device display; receiving a touch input at the first user interface on the portable-device display; and in response to receiving the touch input at the first user interface on the portable-device display: updating a visual appearance of the first user interface on the portable-device display; and maintaining the second user interface on the vehicle display of the vehicle. updating a visual appearance of the first user interface on the portable-device display; and maintaining the second user interface on the vehicle display of the vehicle.