I tried this with the A870 and it worked exactly the same except I had to change the IP setting with SPST instead of QPST, and I'm having issues with MMS outgoing. It senRAB all the way, but then says invalid address, I'll double check all the settings and get back.
Got it working, the mms from /servlets/mms didn't save, so i redid it then i had to turn the phone off and back on and it works. So this method does work for the A870!