Welcome to the Community Forum. I'm sorry that you haven't received your SIM card and are unable to register your online account. Has this been sorted out for you now?
If you still haven't received your SIM card, please let me know. I'll need to take more information first, so I'll send you a private message requesting further details. Just check the envelope icon at the top right of this page.
Need help changing SIM card? Find out more about activating your 4G ready SIM. 4G SIM Swap Help