That's definitely a sweet deal. So far there's no indication Mobilicity will unlock, so for the time being it looks better to start with Wind using their 6 months at 50% off (for $27.50), 3 months in you get it unlocked, and when the 6 months are up switch over.
The word 'Pentaband' means '5 Bands', from the Greek word 'pente' meaning '5'. For a phone to be pentaband it has to support 5 bands. If the phone has AWS support, it doesn't automatically mean that it is pentaband.
Don't send me PMs for questions that can be asked publicly.