purbeckprincess Thank you for contacting the giffgaff Community.
If you have forgotten your Membername/Username or Password then it's easy to retrieve this info via Text from your Phone or by email.
NOTE: By email only if you have access to the email account you Registered with, else see by Text info below.
Goto https://giffgaff.com/support/lost-password and you can use your Mobile Number rather than your Membername should you not know it and have account info and a Password reset link sent to your Registered email address.
To Get Member Details or Reset your Password by Text
If you have forgotten your member/username, text "membername" or "name" to 43430
If you have forgotten your password, text "pass" or "forgotten" to 43430
We'll text it right back to you, the text reply will contain your Membername and a link which will allow you to then change your password if you need to.