Will an Asus Transformer Prime bought in the U.S. work in Portugal?

I live in Portugal and I'm going on vacation to the U.S. in a few months. I'd like to buy an Asus Transformer (Prime or 300) while in the U.S., but I don't know if the Wi-Fi or 3G will work in Portugal. I only know for a fact that 4G doesn't work.

Can anyone help me on this one?