All you need is a rubber band and a screw driver … and of course, a car with an air conditioning/heating vent.
Fish the rubber band through the top part of the vent and pull it through with the screw driver, until you have it in your fingers.
Place your cell phone into the rubber band.
It should appear like this, with the two halves of the rubber band over the screen.
Next separate the two bands, placing one close to the top of the cell phone, and one close to the bottom.
When you let go, your cell phone will be pulled in, close to the vent, and it will stay there.
Now your phone is secure and you can use the GPS or the speakerphone any time you need to. Remember, no texting and driving.