Draco recently purchased a brilliant one from:http://www.gearbest.com/other-motorcycle-accessories/pp_364657.html?wid=21: It's an awesome phone holder and has a USB power outlet built on to it CheersShiney
Just as an alternative...I have used now over the 3 iPhones I have owned (and will do the same with my 4th soon) put the phone in a Lifeproof case to start with.....then purchase the locking belt holster for that Lifeproof case. Remove the belt clip and use 2 small bolts,nuts and washers (to spread load and vibration) to mount the belt holder to a flat RAM mount. That RAM mounts to wherever on the bike Phone locks in place, is in a waterproof case (unless charging) and no problems Cheers