Name: Your Name (What ever you want)
Email: Your email address is your username
Password: Your o2.co.uk account password
Description: O2 UK
Click Next Button
Hostname: pop.o2.co.uk
Username: Your email address is your username
Password: Your o2.co.uk account password
Hostname: smtp.o2.co.uk
Username: Your email address is your username
Password: Your o2.co.uk account password
Click Save Button
Use SSL: None
Authentication: Password
Server Port: 110
Use SSL: None
Authentication: Password
Server Port: 25
You can login o2.co.uk and Signup for o2.co.uk new account on your iPhone from here.