when robyn arias looked at jim's cell phone, it never left florida.ed out, too. where was diana's phone during that time? >> in d.c. >> reporter: that's it? didn't move. >> did not move. the phone went to d.c., went back to florida. >> reporter: reasonable to assume that diana never left d.c.? >> absolutely. >> reporter: but you're smiling. >> there was just a break. the pattern just was off. >> reporter: diana's records were speaking to arias, and detectives were about to get a break that would shift the direction of the entire investigation. let's just say, this case was about to go south. that secret burner phone, who bought it? who used it? get ready for a whole new circle of suspects. >> so what's going on here? how many people are involved in this? >> that's the question of the day. what can i du with less asthma? with dupixent, i can du more....beginners' yoga. namaste... ...surprise parties. aww, you guys. dupixent helps prevent asthma attacks... ...for 3!... ...so i can du more of the things i love. dupixent is not for sudden breathing proble