w580i troubles. Please help!

u need to contact the vendor u bought the phone from, if i understood well it-s at&t, and ask them the phone unlocking code. they will ask u the motivation, u can say that u are going on a travel within 2 days and need to use the sim of a foreign operator. this usually works well as excuse. they won't never control your story and send u the code in 2-3 days. then u must follow one of the numerous guide to UNLOCK the phone u can find on the internet(for example).

sorry for bad english(i'm italian)