>> not too long ago we had pay phones everywhere. and using pay phones was not in and of itself suspicious, but when you have a cell phone, a home phone and phones at your office, the fact that you go a couple of blocks off your normal route to and from home to use a pay phone, that is suspicious. >> once we did the legal paperwork to get the records from the pay phone and we saw that she was calling pagers in new york city. and those particular numbers we knew were associated with cuban espionage. and our suspicions were that she was punching in codes, three or four digits. we knew she was communicating with a pager, sending signals. that told us she was still active. >> so we saw her making all these pay phone calls. the timing of which corresponded with encrypted high-frequency messages being transmitted to