You have the same problem that i have except not with utorrent.
Utorrent and most torrent clients needs incoming connections to work.
The real question here is, How to open ports in the iPhone for incomming connections? When you know that, you just open the ones u torrent needs.
You should call your ISP i am gessing is ATT and ask them how to open ports for incomming connections since the iPhone is being use like a modem.
use this to see if the ports are open try with 80,81 and 8080.
http://www.t1shopper.com/tools/port-scanner/
If you solve this please drop the solution here, thanks.