Have you found the person who contacted Xu Tuanjie before he disappeared?
Chen Ting and all the members of the crime-solving group were very surprised to see Kiko's message.
The person who finally contacts the victim is a very crucial clue in any case.
How did Kiko find it?
"How do you say that?"
Shen Ting left a message asking.
Kiko: “It’s simple!
This case can actually be divided into three parts.
First of all, there is the disappearance of Xu Tuanjie.
Secondly, yesterday evening, Xu’s eldest son-in-law Zhao Xinkai and eldest daughter Xu Liting were killed one after another.
Finally, the car exploded.
It is known that the murderer contacted Zhao Xinkai using Xu Tuanjie's mobile phone.
Before the car exploded, the murderer also used Xu Tuanjie's mobile phone to send a kidnapping text message to Xu Chanjuan.
In other words, the murderer's first target must have been Xu Tuanjie.
After getting his phone, he should have kept it with him.
Otherwise, it would be impossible to observe the situation at the Xu family residence and accurately describe it in the blackmail text message..."
Guan Hongyu: “I think I know what you mean.
When a mobile phone makes a call or sends a text message, it uses the radio frequency module to send the electromagnetic wave signal to the nearest operator's base station.
The phone will send authentication information to the operator network through the SIM card.
This includes the approximate location of the caller.
Kiko, you have asked the group owner for base station information before.
You locked down the murderer's location at the time through the data left by the mobile phone number at the base station when Xu Tuanjie made calls and sent text messages.
And then, through surveillance, you locked onto the other party?"
The entire process of dialing a number on a mobile phone and then the other party answering the call was previously introduced by Kiko in the case of the missing person on a snowy night.
Guan Hongyu obviously remembered it!
Shen Ting also felt that his speculation was very reasonable.
However, Kiko directly denied it:
“How can it be so simple!
o(￣ヘ￣o)
I did manage to roughly determine the murderer's approximate location when he sent text messages and made phone calls through Xu Tuanjie's dialing.
But it's useless!
When the murderer called Zhao Xinkai, he was located in that hotel.
When the ransom text message was sent to Xu Chanjuan, the location was in the residential area where the Xu family lived.
These two places have long been included as key investigation areas.
The murderer was not found in the surveillance footage.”
Maori Kogoro: "So you just said that the murderer's identity has been confirmed, what's going on?"
Guan Hongfeng: "If I remember correctly, Kiko said that the identity of the suspected murderer who last contacted Xu Tuanjie was confirmed.
If Xu Tuanjie's phone is useless...
I remember that the last call in Xu Tuanjie's communication records was from a stranger, most likely the murderer.
Kiko, did you track down the murderer through this phone call?
But I remember that the incoming call number was from a black card, so it didn't have real-name authentication, right?"
Kiko: “You can check even without real-name authentication!
?乛?乛?
The SIM card used by the murderer is indeed a black card and the identity of the user cannot be traced.
But SIM cards cannot be tracked, but mobile phones can!
The SIM card needs to be inserted into the phone before dialing.
During the call process, the base station will not only record information such as the SIM card number and location, but also the IMEI code of the mobile phone itself.
Because before making a call, the operator needs to use the phone's IMEI code to verify whether the device is a legally registered terminal.
I searched for a long time in the base station communication data before I found the black SIM card that finally contacted Xu Tuanjie and the corresponding IMEI code.
The IMEI code is unique and can reveal information such as the device model, origin, and production time.
When selling a mobile phone, the IMEI code may be specially marked, especially when selling a second-hand mobile phone.
-05--3!
This is the IMEI code of the mobile phone that was finally used to contact Xu Tuanjie.
The first six are Nokia 3210, a device model in the Asia-Pacific region.
The 05 at the end indicates that the equipment is produced in China.
The last six digits are the device serial number, representing the device in a batch.
The last digit 3 is the anti-tampering check code.
The key is!
I found this IMEI code in the second-hand mobile phone transaction record in 22 years.
Through the transaction information, I found out that the buyer's name is Zhang Haisheng, and he lives in Dajing..."
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