I'm not so sure he is talking about cell phones, rather I think he may be talking about Motorola's i-Call or something similar. As for legalites with i-Call I'm not certain if monitoring it is legal or not. Making a WAG, I don't see why it would be any different than any other communications.
Having no experience with i-Call though, I can't for sure. I believe there is something similar in EDACs, as I occasionally hear "private call me."