Do not try to activate again! Check your payment card to see if your plan amount has been charged.
Try SIM in some other phone. That will determine if it is your phone’s hardware issue.
Usually 821 is missing/incorrect porting information. Your SIM card will need provisioning to your incomplete account activation. Send a private message to customer support with "incomplete activation" in the subject line and explain in detail your issue. Once the CSA sets it up correctly you will be able to finish your self serve account set up.
