Have Your Information Ready
Buying an iPhone 11 requires more than just a credit card number. You'll need some very specific information on hand when you go to pre-order.
First off, you'll need to have your Apple ID and carrier login information ready to go. That includes user names and passwords.
If you aren't the primary account holder, make sure you track down that information from your parents or significant other before pre-orders start.
You'll also need your Social Security Number (or the account holder's Social Security Number), and the account billing information handy in order to buy your phone.
Some U.S. carriers might require you to ship the device to the primary billing address so if that's not your current shipping address, make sure you get that squared away now.