Try these:
With data plan: Internet:
APN: Internet
Username: web
Password: web
Rest empty:
IPv: Use IPv4 only
MMS:
APN: wap.vodafone.co.uk
Username: wap
Password: wap
WAP gateway: 212.183.137.12
WAP gateway port: 8799 or 9201
MMSC:
http://mms.vodafone.co.uk/servlets/mms
MMSC port: Leave empty
IPv: Use IPv4 only
Without data Plan: (Prepaid, pay as you go) Internet:
APN: pp.vodafone.co.uk
Username: web
Password: web
Rest empty:
IPv: Use IPv4 only
MMS:
APN: pp.vodafone.co.uk
Username: wap
Password: wap
WAP gateway: 212.183.137.12
WAP gateway port: 8799 or 9201
MMSC:
http://mms.vodafone.co.uk/servlets/mms
MMSC port: Leave empty
IPv: Use IPv4 only
I hope this helps.