This looked like a winner in the shop. I wanted a basic but secure phone holder for my stem, that wouldn't ruin the lines of my bike, and fit an 'average' sized phone. Plus it's affordable, easily comes on and off, and doubles as an armband holder - great!
To attach to the bike you have to wrap the strap around the back of the stem and then along the bottom - this stops movement in both directions. The strap could be longer though, and on my stem the velcro end of the strap only just secures to the case (luckily there is a middle velcro bit too so most of the strain is taken by this part - sounds weird but when you use it you'll see what I mean).
I can't vouch for whether it stays done up as I never got that far - because the case has to be done up tightly to stop it from moving, the sides of the case push on the side power button of my phone - meaning the phone goes into a state of constant turn off/on. It's basically unusable. I have tried with two Android phones (a Nexus 5 and a Moto G) and it's the same on both.
If your phone has the power button on the top, or maybe a hard case to 'shelter' the power button, then this case might work for you. Check thoroughly first and if possible try in-store. I am going to persevere with mine, and may fashion a crude back panel to stop the case pushing on the phone.
Lightweight, simple, flexible
Presses side buttons of phone, not secure enough
Thank you for your feeeback. Your findings will be forwarded on to the product designer.
Indeed this is a cheap but effective way of attaching a smartphone to your bike. Many holders such as this which cover the whole phone tend to be a bit awkward when attempting to use the side buttons. It may be better to keep your screen active when cycling if you need frequent access and over short distances should have little impact on battery life.
Peter Lazarus UK Cycling Market Manager DECATHLON