first look at the countries that are NOT in this table
than which countries are NOT in that list ?
and which countries are enormously interested in what passes through Mobile towers and phone companies ?
Belgacom and some other telephone companies may have some scanning to do just to be sure that they aren't impacted. Belgacom is very interesting for a spy because it has so many telephone firms and alliances in so many countries of which a few are very interesting for any espionage agency that follows presumed or real terrorists and their networks and supporters.