Looking at the call records, not long after Fu Liangtao and Pang Jitong returned to the headquarters, Xu Jingjia had already called Fu Liangtao once. Less than twenty minutes later, I called again. During that time, Fu Liangtao was focusing on the analysis of the case in the conference room, but he didn't notice it.

After the meeting just now, Fu Liangtao had a different view of Xu Jingjia.

I called twice in a row, did I have any important information to add?

As soon as Fu Liangtao returned to the office, he called Xu Jingjia back. After connecting the phone, Fu Liangtao heard a mechanical recording female voice and said, "You have already sent your phone number to the 5X8X9X9X message mailbox...... Fu Liangtao immediately hung up the phone, knowing in his heart that Xu Jingjia turned off the phone again.

Fu Liangtao thought about it, then opened the app and added Xu Jingjia as the contact. The process went smoothly, which shows that Xu Jingjia doesn't even have an account for what to do.

Fu Liangtao then sent a message to Xu Jingjia: "Hello! I am Senior Inspector Fu Leung-tao of the Technology Crime Unit. I'm sorry, I couldn't answer your call just now, please call back." After sending a message, a single gray tick appears in the bottom right corner of the message, which means that the message has been sent but has not yet been received by the other person's mobile phone.

When Fu Liangtao received another call from Xu Jingjia, Fu Liangtao and Pang Jitong were sorting out the billing records of the network service provider that had just arrived.

As the phone rang, Fu Liangtao returned to the office in three steps and two steps, and closed the door with him. He took out his manuscript and pen again, sat down, and then answered the phone and said, "Miss Xu, hello, I'm Fu Liangtao's assistant Fu."

……

Fu Liangtao waited for a while, not waiting for the expected response, only to hear the background sound of "salad salad", occasionally mixed with the sound of vehicles whizzing by and some noise, the other party was obviously walking on the street.

Fu Liangtao asked again uncertainly, "Miss Xu?"

Fu Liangtao waited for a while, and the background sound on the phone continued, and suddenly there was a "click", but the phone was hung up. Seeing this, Fu Liangtao estimated that Xu Jingjia should not have turned off the phone, so he immediately dialed back.

"You've already ...... in the 5X8X9X9X voicemail" Hearing this recording of a mechanical female voice, Fu Liangtao couldn't help but think, has the phone been turned off again?

Fu Liangtao walked out of the office with doubts, Brother Cong and Ah Yu had already returned home from work, and in the huge office, half of the lights were turned off, which made people feel tired suddenly.

Pang Jitong had already finished copying the billing records, and was holding a highlighter and began to carefully check Li Bingde's billing records, marking the suspicious records one by one.

Fu Liangtao walked up to Pang Jitong's side and asked, "How is it? Are there any obvious doubts about these records?"

Pang Jitong smiled and said, "How can it be so fast? That's close to three years!" As soon as he finished speaking, Pang Jitong remembered what he saw when he copied the bill records just now, so he immediately changed his words and said, "Slow, it's really there."

I saw Pang Jitong put down the highlighter in his hand, flipped out another billing record to the back of the folder, and said, "Sir Tao, look at it, this is Xu Jingjia's billing record."

Pang Jitong didn't need to say much, Fu Liangtao looked at it and found that Xu Jingjia's billing record was indeed unusual. Fu Liangtao couldn't help but sit down, and as soon as he took this record in his hand, he found that this record was surprisingly thin, and it didn't look like a three-year record at all. Fu Liangtao pressed his doubts and quickly browsed the records in his hand.

The billing records of the network service provider in relation to the mobile phone monthly plan will itemize the records of incoming calls, messages and data activities, etc. related to the user's mobile device, and if the user's details are further provided to the service provider, additional historical call history, billing information, SMS messages not received by the user, and the base station (mobile signal transmitting station) to which the user's mobile device has been connected.

Different from Li Bingde and Zhou Muqing's billing records, Xu Jingjia's billing records are very "neat". Since the end of 2017, she has had only a handful of incoming calls and messages, and the total number of unreceived SMS messages is more than that of incoming calls and messages.

Fu Liangtao checked Xu Jingjia's information again and again. The network company's records are correct, and this record already includes records of two accounts and three phone numbers in Ms. Hui's name, one of which is a one-card-two-number China-Hong Kong account that is the least used, and almost all of them are text messages sent by the Chinese provincial government that have not been received. In this account, even for nearly two years from 2017 to 2019, there was no record of incoming calls, messages and data activity.

Xu Jingjia pays a monthly fee of 100 yuan for this account, but she has almost never used any of the services in this account.

The other number, the phone number left by Hui Jingjia, is the cheapest monthly plan in Hong Kong. This phone number has a little more records than the previous account. It's just that this account has less than 10 minutes of calls per month, and there are almost no messages. The account only calls to three specific phone numbers, and the data usage is far from the average person's usage level.

This record proves that Xu Jingjia is not lying, and her phone is really turned off most of the time.

Fu Liangtao flipped through the records again and found that Xu Jingjia's billing records were normal until the end of 2017, and he could even see Zhou Muqing's phone number occasionally appearing in the call logs. It was not until early 2018 that the dosage dropped sharply.

"Have you investigated Xu Jingjia's other phone accounts?" Fu Liangtao asked, while glancing at the base station numbers connected to Xu Jingjia's mobile phone, he found that these numbers rarely changed, and almost all of them were the same. You don't have to guess to know that it should be the base station set up near Xu Jingjia's home. The frequency of connecting to the base station shows that Xu Jingjia only turns on the mobile phone once in about ten days and a half months, which is not an exaggeration.

Pang Jitong immediately responded: "Yes, after making the copy just now, I have already called the telecommunications company to confirm, and there are only these three numbers registered with Xu Jingjia's information and real name."

Fu Liangtao casually picked up the highlighter at hand and marked some base station numbers that only appeared on Wednesdays, Saturdays, and Sundays, as well as the three numbers that had exchanged phone calls with Xu Jingjia.

Then, Fu Liangtao said to Pang Jitong, "Tomorrow, you can help me check the corresponding locations of these base stations, and who are the holders of these three phone numbers?"