Just dont tell them you aren't the primary acct holder. Act like you are as long as your name is on the account it will go through. Hell, my middle name is on the account and I used my 1st name and it still worked.
I tried that on Launch day, and when it was my turn they refused to sell me the phone, saying I am not the primary account holder even though I told them i am an authorized user. I spent a total of about 5 hours in line only to find out that I cannot purchase one for this reason. I was extremely pissed.
I tried again next week, and this time I called Apple and talk to the manager. I told them my scenario and they told me i can get the iphone even if i am not primary account holder, as long as I know the last 4 digits of the primary accounts holder SS# i am fine. I then asked him how come this wasn't the case when I attempted to get the iphone on launch day and he told me that there has been a lot of miscommunication about that and that you don't have to be the primary account holder in order to get the phone as long as you have their info, you are fine.
Not everyone was on the same page and it still looks as though apple employees are all on different pages about this primary account holder issue. That is stupid, because some primary account holders could live in a different state. How are they able to show up? Dumb way to sell a phone. They are really making it complicated this time around.
I would call 1st and make sure before you wast another 2+ hours in line like I did.