Here's our handy guide on locating your subscriber number, simple follow the steps below.
Login to your online account:
Select 'Welcome back' in the top left-hand corner of the page
Then select 'Edit your profile'
Your account number is then shown under your contact details
Take your account number and remove the zeros, then start this with FT20. If your number was 00028477 it should now look like: FT2028477
Enter this number into the promotional code as shown below: