calls can be made threw the internet with the correct app. Like gtalk for example. Gtalk is free at the moment for making calls inside the USA. There is an app that uses your gtalk account to let you make calls. So it just depends on the where you are located.
As for phone service, most likely not. As its a Tablet OS and not a phone OS.
IT Specialist and Consultant Lenovo Tablet Evangelist Current Machines: IdeaCentre A300, and ThinkPad Tablet