On your child’s smartphone, go to mobile.three.co.uk
Then select ‘My3 account’.
Controls & Settings guide
All new Three devices have a default block on adult content. However, if you are over 18 this can be switched off through a verification process using a credit card.
A credit card to verify you’re over 18.
Afterwards you will be able to restrict the adult content and create a PIN code for future changes.
Follow these links to learn more or download this information