I have been trying to pre-order from apple.com Where it says "Check eligibility for your AT&T account. Please provide your AT&T account information." I am on a family plan on my line is not the main line / phone # for the account login. The main line / account login phone # is not eligible for an upgrade but my line is. When I enter my phone number it says the login information is incorrect, when I enter the main line / account phone # it says it is not eligible for an upgrade. Any ideas? Thanks.