I think it'd be a great idea if people were aware of how an APN sometimes needs to be setup. If you weren't aware of it (many people aren't) you may come here to the forums to complain about data not working. My friend just signed up and told me a week in that he was ticked off because he wasn't getting data. I simply sent him a link to the guide on the forums.
Like the automated text you get when you sign up, if someone signs up for data they should also get a message telling them how to setup the APN, or at the very least send them a link to a guide on how to do it.