Athens area code: 210
The Hellenic Telecommunications Organization (OTE S.A.) is the main telecommunication company in Greece providing both fixed and mobile:
Consider signing up for a Skype account on your PC. The software is free to download and calls to other people that are connected to Skype via their computers cost nothing (you'll need a microphone, headset or USB phone). You can also buy credit to make calls to regular phones from your computer at very reasonable rates: