The Jez McKinley Wiki

Android MMS Settings (on Desire)

Name: Vodafone
APN: wap.vodafone.co.uk
Proxy: Not set
Port: Not set
Username: wap
Password: wap
Server: Not set
MMSC: http://mms.vodafone.co.uk/servlets/mms
MMS Proxy: 212.183.137.012
MMS Port: 8799
MMS Protocol: Wap 2.0
MMC: 234
MNC: 15
APN Type: Not set

MMS O2 Android

NAME	O2 MMS
APN	            wap.o2.co.uk
PROXY	        http://wap.o2.co.uk
PORT	        9201
USERNAME	o2wap
PASSWORD	password
SERVER	        http://mmsc.mms.o2.co.uk:8002
MMSC	        http://mmsc.mms.o2.co.uk:8002
MMS PROXY	193.113.200.195
MMS PORT	8080
MCC                234
MNC                10
APN TYPE	mms

alternative setup here : http://xania.org/200907/android-mms-on-o2-iphone