Here you'll find the MMS settings for the most popular providers!

Thanks to Firmware 3.0 you can use copy & paste to insert these settings!

APN: free.A1.net
User: ppp@a1plus.at
Pw: ppp
MMSC: mmsc.A1.net
Proxy:

APN: gprsmms
User: mms
Pw: mms
MMSC: mmsc.t-mobile.at/servlets/mms
Proxy: 10.12.0.20:80

APN: Orange.mms
User: mms
Pw: mms
MMSC: http://mmsc.one.at/mms/wapenc
Proxy: 194.24.128.118:8080

APN: mms
User: wap@telering.at
Pw: wap
MMSC: http://relay.mms.telering.at
Proxy: 212.95.31.5

APN: drei.at
User:
Pw:
MMSC: http://mmsc
Proxy:213.94.78.133

APN: internet
User: iphone
Pw: password
MMSC:
http://mms.t-mobile.de/servlets/mms
Proxy: 172.028.023.131:8008

APN: mms.eplus.de
User: mms
Pw: eplus
MMSC: http://mms/eplus:5080
Proxy: 12.23.97.153:8080

APN: event.vodafone.de
User:
Pw:
MMSC: http://139.7.24.1/servlets/mms
Proxy: 139.7.29.17:8080

APN: internet
User:
Pw:
MMSC: http://10.81.0.7:8002
Proxy: 82.113.100.5:8080

APN: mms.tim.it
User:
Pw:
MMSC: http://mms.tim.it/servlets/mms
Proxy: 213.230.130.89

APN: tre.it
User: tre
Pw: tre
MMSC: http://10.216.59.240:10021/mmsc
Proxy: 62.13.171.3

APN: mms.vodafone.it
User:
Pw:
MMSC: http://mms.vodafone.it/servlets/mms
Proxy: 10.128.224.10

APN: mms.wind
User:
Pw:
MMSC: http://mms.wind.it
Proxy: 212.245.244.11

APN: mms.pt.lu
User: mms
Pw: mms
MMSC: http://mmsc.pt.lu
Proxy: 194.154.192.088:8080

APN: portalmmm
User:
Pw:
MMSC: http://mp.mobiel.kpn/mmsc
Proxy: 10.10.100.20

APN: MMS
User:
Pw:
MMSC: http://mms.orange.nl:8002/
Proxy: 10.250.255.183

APN: multimedia
User:
Pw:
MMSC: http://mmsc.mms.telfort.nl:8002
Proxy: 193.113.200.195

APN: mms
User: tmobilemms
Pw: tmobilemms
MMSC: http://t-mobilemms
Proxy: 10.10.10.11

APN: live.vodafone.com
User: vodafone
Pw: vodafone
MMSC: http://mmsc.mms.vodafone.nl
Proxy: 192.168.251.150

APN: event.swisscom.ch
User:
Pw:
MMSC: http://mms.natel.ch:8079
Proxy: 192.168.210.002:8080

APN: mms.sunrise.ch
User: mms
Pw: mms
MMSC: http://mmsc.sunrise.ch
Proxy: 212.35.34.75

APN: mms
User:
Pw:
MMSC: http://192.168.151.3:8002/
Proxy: 192.168.210.2

APN: wap.cingular
User: wap@cingulargprs.com
Pw: CINGULAR1
MMSC: mmsc.cingular.com
Proxy: 66.209.11.32