a bit old, but after forgetting about this, I finally figured out how to do this
It's pretty nice, and a roundabout way of doing this though. I had to get 2 apps, WMWifirouter and Wifi remote access. I don't know if there are free alternatives but I like these two so I used them.
How I did it was to create a hotspot using wmwifirouter, then I disabled the sprint connection through comm manager. This allowed me to turn phone into a wireless hotspot with no data connections that other people can connect to. Then finally using Wifi remote access, they could upload/download things to phone.
Anyways It's pretty nice when I'm outside and need to share things with a group of people without actually having everyone having a data plan. Planning on maybe getting a solar charger or something and seeing if that works later on so I can not have to carry spare batteries.
It works well in large public areas since we'll always have a "private" network.