Have read the procedure to use a proxy on pre-3.0 firmware for the iPhone (http://www.hackint0sh.org/f127/6365.htm), but cannot get this to work on 3.0 or newer firmware. Currently the phone is on 3.1.2, and I followed the guide, but ofcourse substituted the proxy and own IP in the proxypac-file for the one I need to hit on the AT&T network. However, I do not see any traffic through the proxy.

Should this not be the way to do it for a proxy on 3G even on newer firmware? Since it is no longer needed for TMO, I cannot find anything about this for anyone with 3.0 or newer firmware.