Use a rubber band to hold your phone
Looking at your phone while driving is extremely dangerous and should be avoided at all costs. However, if you need to glance at directions and you don’t have a smartphone mount, you can thread a rubber band through your air conditioning vent.
Insert the rubber band through the top of the vent and pull the other half through the bottom. Arrange your phone so that the top of the rubber band is holding the top of your phone, and the bottom of the rubber band is holding the bottom.