Soon you be able to make a .cab file with the settings you need using the CustomCabbage website!
Its far from complete but i thought i'd give you a little teaser....
This .cab file will ONLY work prperly on 2003 and 2003SE phones which use the Arcsoft MMS program
Below are the settings for O2 UK Pay As You Go and has been tested on devices using Audiovox and I-Mate 2003/2003se roms.
Please remove all gprs, mms, csd and proxy settings from data connections and remove or rename the settings in the Arcsoft MMS program before you install this .cab file.