John Arquillais an American analyst and academic of international relations... (wikipedia)
They're not using satellite phones. They're using Web sites and posing as teenage girls.
It requires no banks, no safe-deposit boxes. It just needs communication.
Clues are often very fleeting in nature. The question has become, 'How much can and should the government be doing, and what is the legality?' I'd be comfortable relinquishing some privacy for security. The question is, where is the equilibrium point?