I tried 3 other holders and none worked. It's designed to fit almost any size phone - the flared panels are only on the side and you can have a very tall, narrow device if you want :) It also pairs well with a case. It got good reviews on a mountain bikers bike site, so I gave it a try. Like many other people, I put it in a suitcase and shook it as hard as I could before installing it. It didn't move. I took it on a trip with ease and had great access to the screen for mapping and training. It is very easy to remove when you want to take photos or play Pokemon Go. I have a Quad Lock Poncho Slip-On Splash Proof Cover for iPhone 6/6S - Clear that I haven't tested yet. Also, like others, I'm not sure about the durability of the attachment straps or hinge; If there are problems I will update my review.
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