Hi there and welcome to the community.
To remove the adult bar and access over 18 material,you must now provide either a valid Full or Provisional uk driving licence or valid uk passport and you can change your "settings" here http://j.mp/phone-settings
Unfortunately If you DO NOT have any of the above documents required,the adult bar can NOT be removed due to these requirements.
*(Northern Ireland drivers Licences are NOT accepted and Northern Ireland customers must use the passport option).*
If you are having problems removing the bar,or filling out the forms provided,a giffgaff agent CAN assist in helping you to achieve this,but can NOT remove the adult bar for you.If you would like the help of a giffgaff agent,simply click onto the link below. (A response can take up to 24hrs,so please be a little patient,thanks 😀 .http://giffgaff.com/support/ask/adult_content_restriction
giffgaff are always looking into other options to remove the adult bar and understand that if you dont have a uk licence or passport,this will cause frustration,but unfortunately there is nothing that can be done,without the required documents,thanks again 🙂 .