Don't get the BikeLogic crap, it's all show I will give the one one I have cheap junk does work.
I have done away from all these and now use a LifeProof Case with the Bike or GoPro Mount. Much better solution by far!!!
http://www.lifeproof.com/shop/cases/iphone-4-4s/
If you get the GoPro mount like I did you can now mount to all GoPro adapters, window, dash or your car, bike, on the end of a pole when snowboarding, underwater, absolutely love it!!
What do you use to attach the phone to the GoPro? I thought they only woked with their own cameras etc