chapter 699 Found the clue!

Upon hearing Mateo mention the call recording, Serenity was taken aback.
"When I was gathering evidence, they had already searched his phone and didn't find any of these things!"
Mateo shook his head, "Jacob used a special encryption method, using four false backends as springboards. Without these springboards, these things cannot be found."
"Oh, I see." Serenity nodded.
Mateo glanced at Serenity, "What do you understand?"
"Never mind that," Serenity changed the subject, "Let's listen...