The holder has a plain spring clip that secures the phone. The sides and top corners of the phone are accessible, the bottom isn't great, but there is a cutout for accessing the iPhone's Lightning connector and headphone jack, not sure on Android. The metal bar clip is strong but the two rubber strips feel a little awkward so I made a simple mod. I punched a 1/4" hole near the end of each strip and threaded a stop screw through the holes, locking the strips in the clamp. I've ridden it about 35km so far and it's ok.
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