I was on the bike carry on the search for a reasonable solution my grade 4 so that it remains one hand protected and on the other hand at all times to operate.
This Bikerset ideal for this purpose, however, I must point out that it is actually too big for the Grade 3 & 4, but
if they are stuck in a hard cover, they no longer fit into a custom-fit design.
So the only possibility is a size larger or each time to remove the cover.
I've stuck with some foam a holding frame in this set, so that the smartphone fits well and does not wobble, especially since you can lay one cable for the headphones better by something gößeren place also.
The included handlebar bracket can be adjusted in a variety of handlebar is quite stable and the plug attachment can be used for other models with the same essay.
So my recommendation.