3G cards to send SMS and call phones from?

Hi, guys,

I think this topic could fit in here, if not, please delete it, cheers.

I recently built my first ever PC, and it is a big success, but now I am looking to upgrade it to make it more than just a PC. I want to make it so that I can send texts and call phones from my PC. I looked at all the different programs that pair your phone and PC so that you can get notified if your phone gets a text. I want to know if there is a way to put a SIM card inside my computer and make it work as a cell phone. Because I am in Europe, some online solutions (send an e-mail to a specific e-mail address with the recipient's number as the username) won't work for me. Is there something that I can plug into my USB/PCI slot and make it receive signal? If so, what is the name of that thing?

Thank you.

Oh, shoot, VoIP. Sorry, I'm retarded. I'll delete this topic, once I know how.