The application I'm going to talk about is named "Discovery". This works only if the computer and the iPhone are connected on the same Wi-Fi. You can download and upload various content between your computer and your iPhone, without need the use of any cable. You can view documents, video, music, pictures and more.
It has a function named "Nearby", which will detect any iPhone that is around and has Discovery service running, allowing you to share files with them. After launch, the application will tell you what address to type into your browser in order to access the iPhone. It's compatible with any OS. And the best part, it's FREE. (commercial version also available, but the only difference is that it removes advertisement)
Search it in App Store: "Discovery".