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Recently, a reporter from Nanduwan Finance observed that many users on social platforms reported that their mobile phone cards were suspended for no reason by operators. To restore the normal use of the numbers, they need to go through complicated steps, which even affects their daily lives.

In this regard, Nanduwan Finance reporter searched the Black Cat complaint platform with the keyword "unexplained shutdown" of the three major operators and found that there were nearly a thousand complaints about the three major operators' unexplained shutdown. The reporter sorted out the complaint data this year and found that the number of users who reported unexplained shutdowns has increased recently. In addition to shutdowns, many users have concentrated on reporting the difficulty of restoring their phones. It is worth noting that in addition to the three major operators, users of operators such as China Radio and Television, Phone World Group, Alibaba Communications, and Minsheng Communications have also reported the problem of unexplained shutdowns.

In response to the above questions, Nanduwan Finance reporter consulted the relevant operator staff, who said that this situation is actually a protective shutdown in response to the frequent occurrence of telecommunications fraud. If users want to restore their phones, they can follow the official shutdown SMS they received, consult the official customer service and follow the instructions to bring relevant documents to the business hall to restore their phones.

　　Users' services are frequently suspended without reason, involving more than just the three major operators　

Nanduwan Finance reporter observed that the reasons for the suspension of service were different. For example, a Unicom user said that he had to post a remote interview notice for work and called more than 10 applicants in more than an hour. Then his service was suspended by the operator because "big data identified it as a fraud number." After appealing, he was told that he had to go to the business hall in person to sign a letter of commitment before his number could be restored.

In addition, there have been recent media reports that a man claimed that the Shenzhen mobile phone number he had used for 14 years was "protectively shut down", and when he went to apply for unblocking, he was told that he needed to provide relevant information in Shenzhen.

A reporter from Nanduwan Financial News Agency observed that most of the people had removed their telecom SIM cards from their regular phones and replaced them with new phones the day before. The next day, they received a text message from 10,000 saying that the phone number "had not been used for a long time or was used abnormally" and that temporary protection measures had been taken, including restricting calls and text messages.

A reporter from Nanduwan Finance searched the Black Cat Complaint Platform with the keyword "unexplained shutdown" and found a total of 9,142 related complaints. In addition to the three major operators, users of operators such as China Radio and Television, Phone World Group, Alibaba Communications, and Minsheng Communications have reported problems with unexplained shutdowns.

Among the victims' reasons for complaining about the suspension of service, there were many reasons, including "the operator said the number was suspended due to violations of regulations", "the secondary card, data card, and children's watch secondary card were suspended", "the service was suspended due to making and receiving a lot of calls and sending text messages at work", and "the service was suspended due to fraud".

　　Frequent phone calls or frequent changes of mobile phones may be considered abnormal behavior involving fraud

In this regard, a reporter from Nanduwan Finance consulted the staff of China Telecom, who said that the unexplained shutdown may have triggered the system's anti-fraud model, which is actually a protective shutdown in response to the frequent occurrence of telecommunications fraud.

Relevant personnel told reporters that high-frequency calls or frequent changes of mobile phones, multiple insertions and removals of SIM cards, and use of new cards across provinces and regions immediately after issuance may all be regarded as abnormal behaviors involving fraud.

"Fraud-related cards have the characteristic of changing terminals. But it does not mean that the card will be suspended if the phone is changed. There is no necessary connection. There must be other actions to trigger the shutdown." The above-mentioned person revealed that some criminals have previously used "GOIP" devices to disguise local numbers to commit telecommunications network fraud. As a virtual dial-up device, GOIP has the characteristics of human-machine separation, remote control, long-distance dial-up calls and support for multiple phone cards, allowing criminals to remotely control it abroad. Therefore, frequent insertion and removal of phone cards and high-frequency call signs may be regarded as fraud-related numbers by the anti-fraud system.

Telecom staff also said that if an old number is suddenly activated after not being used for a long time, it may trigger abnormal monitoring of the anti-fraud model, causing the user's service to be shut down.

It is worth noting that previous regulations stipulated that the upper limit of the number of numbers that a user can own in one operator is 5. Currently, the three major operators can handle a maximum of 15 mobile phone cards in total. In order to facilitate Internet access and communication, many users will open a few more "functional cards" in their names as data cards, work cards or family cards.

However, if users open too many cards exceeding the prescribed number or use them in different places, it is easy to cause monitoring by the anti-fraud model. Because renting, selling, lending, and buying bank accounts, payment accounts, and personal phone numbers are all illegal and criminal acts, and are also an important link in the fraud chain, opening too many cards may trigger system monitoring.

　Strict recovery steps are to ensure user safety

Nanduwan Finance reporter also found that most users reported that their numbers could not be reactivated online, and they needed to go to offline business halls and the place where the number was owned or the place where the card was issued to go through the reactivation procedures.

In this regard, Nanduwan Finance reporter consulted the operator's relevant personnel, and the staff said that the biggest reason for requiring offline re-enabling is to protect the user's information security. The business hall where the card is opened usually has full management authority over the local number.

For example, the "14-year Shenzhen Mobile user" mentioned above had previously been reported by the media to need local social security to be "unblocked". However, on July 25, Shenzhen Mobile said that in fact, it only takes real-name verification at the business hall and showing the Guangdong Residence Code to restore the connection to "unblock".

Shenzhen Mobile said that there are currently three main types of "card suspension". Numbers with medium to low fraud risks need to be restored after completing online real-name verification. Customers can operate according to the instructions in the notification SMS; numbers with medium to high fraud risks must go to the business hall for real-name verification and show the Guangdong Residence Code before being restored; numbers with extremely high fraud risks, in addition to the previous verification procedures, also need to provide social security participation information (without participation location and time restrictions).

Another operator staff member introduced that when encountering a downtime, you should pay attention to the safety tips and warning information sent by the operator and follow its instructions. Users can first try to apply for restoration of the service through three online channels: the operator's official website, APP, and WeChat mini-program, or call the operator's customer service number for consultation.

Secondly, the staff reminded users not to restore their machines online through unknown links, as this poses a risk of being exploited by criminals.

Written by: Nandu Wancai reporter Kong Xueshao, Yan Zhaoxin, intern Guo Jiayi