Is it possible to insert a simcard into macbook? Not 3g, oldest kind of simcards.

I don't want to call via a phone. I prefer making calls via computers cause their keys and screen are bigger. My mobile operator provided me with an unlimited tarif. So, is it possible to use a macbook as a phone, that is to insert a sim card into it or connect the sim via a usb device or conect it in another way? I mean a kind of sim cards that can be used even by most primitive mobile phones. That is, not a mini sim card for iPhone, not a 3G sim card.

Message was edited by: misclellanious matters