Hi @AndrewIm_446948 a PAC from O2 usually begins with TEL followed by 6 numbers. Does that match what you are submitting? You might also want to try submitting your number beginning with 44 instead of 0 to see if this makes a difference. If it's still failing please get in touch with our customer support team as they will be able to test it and tell you the specific reason for the failure. https://smarty.co.uk/contact
