Hi all, just got this brilliant app on my iPhone. I looked around and couldn't find *working* settings for 3 Mobile in Australia...after going through my old handset's settings I figured it out. Note they are similar to the ones listed here:
http://www.activexperts.com/mmstoolkit/mmsclist/
except the proxy settings are now correct. Here they are:
MMSC: http://mmsc.three.net.au:10021/mmsc
Proxy: 10.176.57.25:8799
APN: 3services
NB. When sending or receiving an MMS you must wait around 15secs for the connection to establish (for the M icon in the top corner to turn green) otherwise you will get a connection error message. This is probably normal for all carriers...though I have no way to tell! Enjoy