Hint: If you don't know the right parameters contact your mobile operator. You can normally find the APN on their home page in the 'Customer Service' section or contact the customer care call centre.
Hint: You can try to type in "Internet" in the APN field and leave the Username and Password fields blank. Often this is the default parameter settings used by operators.
Hint: If the screen for entering the APN settings is hidden or locked you must contact your mobile operator to get instructions on how to set-up the APN setting profile for your iPhone.