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This is what I use on O2.
Mobile Web
Name: O2 Mobile Web
APN: mobile.o2.co.uk
UserName: web
Password: web
MCC: 234
MNC: 10
APN Type: default
And Post Pay,
Name: O2 Post Pay
APN: wap.o2.co.uk
UserName: o2wap
Password: password
MMSC: http://mmsc.mms.o2.co.uk:8002
MMS Proxy: 193.113.200.195
MMS Port: 8080
MCC: 234
MNC: 10
APN Type: mms
I use these settings too only for mobile web username is o2web and password is password......will that make any difference?
i tried that and when i saved it nothing saved again. i have done this several times with all different settings and all have failed epically . just a blank screen appears like originally.

I have had major issues with apn`s and mms etc..
I`m rooted ( had the same issues before root )
o2 pay monthly UK. The only rom I`ve had mms work correctly is Devillain.
ANy other i`ve tried I just can`t send ( sometimes receive ) mms messages.
Really annoying..
Reading that you only need one APN for the Desire..
Someone else says you need both...
Ive used the settings from the o2 Desire website... they don`t work on my current rom![]()

Just noticed these settings online, no idea if they still work but give them a go.
WAP2.0
Profile Name: O2 Ireland
Homepage: http://www.o2.ie
Proxy: 62.40.32.40
Port: 8080
APN: internet
Bearer: GPRS
MMS
Profile Name: O2 MMS
Homepage: http://mmsc.mms.o2.ie:8002
Proxy: 62.40.32.40
APN: internet
Bearer: GPRS
Open Internet
Profile Name: Internet
APN: internet
Email Client
SMTP: 62.40.32.37
POP3 Server: 62.40.32.37
Proxy: 62.40.32.40:8080
APN: internet