If you have an iPhone, you can change your phone number and email address in-app. From the home screen, tap the menu on the top left. Then tap 'Settings' and then tap 'Change Personal Details'.
We will ask you to verify the changes - the app will prompt you to verify the new mobile number before you do anything else.
If you have an Android device, please get in touch with our support team in-app or via firstname.lastname@example.org. Along with the changes you want to make, please confirm your birthday so we know it's you.