On Sat, 9 Jul 2005 12:28:27 +0100, "The Todal"
wrote:

At the time of the Spanish terrorist attacks it was suggested (maybe never
conclusively proved) that the bombs were linked to a mobile phone trigger so
that they could be detonated remotely.

I think they were triggered by the clock / timer on a mobile phone but
not by a remote signal - so the question of whether there was GSM
coverage probably isn't relevant; for that instance at least.