The woman's car has no place to store a phone other than the armrest and no phone mount is required if her navigation is fine. This works great with their big phone (GS20+), badges and little things like BT headphones. We only needed one for the passenger - I wouldn't want it in my seat when I'm driving and moving the seat back and forth wouldn't be ideal - so we have an extra one for the other car. The slot is great for a charger, and the divider can be adjusted or removed altogether.
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