Vodafone (Greece) was used to tap PM, ministers and others
Illegal software installed at Greece's second biggest mobile phone operator, Vodafone Greece, allowed calls to and from about 100 phones to be recorded. Most belonged to the government but one was owned by the U.S. embassy in Athens, officials said. Source :Reuters
What is really suspicious is that Vodafone immediately deleted the "mallicious" software as soon as it discovered it, thus making it impossible to trace the authors or the source of this security breach.
An other interesting point is the topology of the antennas used for the whole operation: they form a triangle with the US embasy in the center of it...