Review on Car Phone Mount Windshield, Long Arm Cell Phone Holder for Car Window, Universal 360 Degree Rotation Windscreen Suction Cup Cradle with Anti-Shake Stabilizer, Compatible with iPhone, Samsung Galaxy by Jonathan Clark

I've only had this block for a week but it seems stable and unlikely to fall off. We'll see when the summer weather hits in a few months. What I like best is that the long, bendable neck allows you to mount the device in different locations to keep it at the perfect distance for your needs. UPDATE: A few months after installing the mount, the suction cup fell out of the window. and a piece of glue fell off the dashboard. It's not that easy to put back in, but I put it back in and it sat there for a couple of weeks and then fell off again.