Are Somalian pirates such a big problem

When the world has so much of technology at hand, it is a mystery to me, why Somalian pirates are still able to get away with their constant predative activities. They themselves use quite primitive craft. Their only concession to modernity is the cellphones that they use. This itself makes them vulnerable and tracable and I wonder why the govermnents of the world do not make use of this to hunt them down and eliminate them altogether.