Hi @MrsLezard!
Welcome to the AT&T Community Forums! Thank you letting us know about the issue you are having with trying to register an account online. I am sorry that registering your account is not going smoothly. I will be glad to assist you.
If the system is not recognizing your wireless number and billing zip code, then we will need to speak with you. I will be sending you a private message to get some contact information. When you get it, kindly respond with your full name, phone number and a best time to contact you. That way, we can try to figure this out together!
We look forward to hearing from you. Thank You!
Tim, AT&T Community Specialist