Can I still use my sony ericsson w710i as an mp3 player without a sim card?

[ludachris1982]

I bought the phone unlocked so I could use it in Ghana, where I am from... However I have an extremely long flight tomorrow and was wondering if I can use it as an mp3 player before i get a carrier for it? When I turn the phone on it asks for the sim card and the only thing it will let me do is watch the moronic 30 second "demo". I am assuming the lack of an sim card is what makes it "unlocked", but am unsure, and there was not one in the package..