what does this message mean when I turn on my iphone?

My iphone first had no service when this happened.. i hadnt activated the sim card yet.. its been factory reset because i got it from someone.. when i turned it on with the sim card inside a voicemail pops up and asks me to listen.. i listened to it and it says "the services you are trying to use have been restricted or not available" what does that mean?? Today i activated my sim card and im transfering over my phone number.. the voicemail is still there and i cant call out.. is it because my phone number isnt transfered over yet and i still dont have any service? Its been hours and it usually doesnt take this long for the transfer. Does this message mean something else?