If I buy an unlocked GSM Samsung Galaxy nexus will the data work with ATT prepaid go service? I am planning on having the 50 dollar monthly unlimited talk/text/web. Do I need to add anything else to it?

Has anyone tried it?

Will my turn by turn turn google directions work?

Will I get HSPA + speeds on the nexus.

Sorry I tried asking this question in android central, but no body answered.