HBO

You'd think it would be simple, but there are actually several variables to this question:
If you subscribe by phone and have only one cable receiver, it should be available immediately unless there's a technical problem. If you subscribe by phone and have more than one receiver, it may be available on one but not others depending on whether the order was entered correctly or whether there's a technical problem. If you subscribe online, it may take time to process and then it's subject to the previous two issues.

Basically, this is more of an account-specific question, and it would be best to email us at coxhelp@cox.com or call your local technical support.