There are websites the show you. Its a lot of work in the terminal. This website is really good http://www.hacktheiphone.com
They probably changed the ATT logo file on the iPhone to say cingular. Its not hard, its all on the website.Ive got to wonder if these are not photochops then why do they say Cingular insted of ATT in the corner.
these look terrible compared to just the original iPhone icons.
really? forgot about that... maybe I'll try it tommorrowYou won't lose warranty. Just restore it, it goes back to brand new factory settings, no way to tell if its ever modified.