I just got done with a live chat with AT&T:
"Tiffiny Brunson: Hello Mr. X.
Tiffiny Brunson: I will be more than happy to assist, please allow me one
moment to access your account.
you: Hello!
Tiffiny Brunson: May I please have the last four digits of your Social
Security number to access your account?
you: X
Tiffiny Brunson: Thank you.
Tiffiny Brunson: How may I assist you?
you: I noticed that I am eligible to upgrade to the iPhone 4. I was
wondering what price I will have to pay for the 32 GB version. Will it be
the full discount or the early update discount?
Tiffiny Brunson: I am still reviewing your upgrade inquiry.
you: OK.
Tiffiny Brunson: You are able to get it at the lowest discount price of
$299.
you: OK Thanks!
Tiffiny Brunson: Did you have any further questions or concerns for me on
today?
you: No, thank you for your help.
Tiffiny Brunson: Thank you for selecting AT&T as your service provider. We
appreciate your business. It has been my pleasure assisting you today.
Please click the close button to end your session. A customer satisfaction
survey will automatically appear and we would appreciate your feedback."
I upgraded from original iPhone at 3GS launch and my bill is over $100.