It
could've gone down like this...
Someone gets wind that Hezbollah members use pagers for secure comms. An influx of "modified" pagers gets sold in bulk to Hezbollah members. The selling party waits until the time is right to "activate" those modifications via a page, radio, or internet ping.
*BOOM*
If you think that's crazy, give a Florida-Man in a lab coat an unlimited budget and tell them to come up with the most terrifying thing in the skies since the Prehistoric era and you get...
Ya'll see where I
can go with this."