I have seen different types of phone mounts or phone holders for car. I had one dashboard holder which worked fine during winters, but it was not able to stick to the dashboard with increase in outside temperature. I was looking for some phone mount that never fall out from the dashboard.
I got an air phone mount from CacheAlaska for review purpose. I've been using this mount for 2-3 weeks and it's been working fine. It is a very small mount , practically as small as a hair clip. It is 5.5 cm in size and can be stretched till 7.5 cm. I have nexus phone and it fitted well in this mount. This mount is really easy to use, just press/fit it against the air vent and then you can stretch it and fit phone in it. It stays quite close and you can easily operate the phone while driving. I normally use it when I use phone for navigation purpose.
This mount securely holds my phone and phone never fell in case of high speed or road bumps. I can easily operate my phone when it is on mount and can also charge it at the same time. This is available at CacheAlaska's website and currently costs $9.97.