What should I do if the caller ID of the mobile phone is all unknown

1. According to the information you provide, if your mobile phone is called and displayed is unknown, it is usually caused by the caller ID function has not been activated on your mobile phone, and it is recommended that you apply for activation again.

2. You can apply for caller ID in the following ways:

or bring a valid ID card to the Unicom business hall in the place where you belong for processing;

If you are using a 4G package**, ** does not give away caller ID service, you need to apply for additional activation, you can apply through the following channels:

1) Log in to the online business hall.

On the home page, click on the self-service to handle **handle the 4G combination**, click on it to re-select the change**business package and re-check the caller ID;

2) Log in to the mobile phone business hall client and click on the service at the bottom to handle **Change 4G**Change 4G Combination**, click in to change **Business package, and re-check the caller ID to change.

If you use an OPPO phone to call does not show the other party's number or displays an unknown number, how to deal with it:

1. It may be that the caller ID function is not activated, you can contact the operator to confirm whether to activate the caller identification service;

2. If the other party has set up "Caller ID Hide", the caller ID will not be displayed when the mobile phone receives an incoming call;

3. Some third-party software also has the function of setting the number to unknown or hiding the caller number, if you have installed such software, you can try to uninstall the software in turn to confirm whether it can be recovered;

4. If the SIM card is placed in other mobile phones, it is recommended to replace the SIM card;

5. If this phenomenon still occurs when other SIM cards are put into the mobile phone, please back up your personal data, and bring the purchase invoice, warranty card and mobile phone to the nearest OPPO customer service center for testing and processing.

1. The ** is from the network**, or the caller uses network software to hide the number.

2. The user has not activated the caller ID function. Of course, it is also possible that I accidentally canceled the call in ** last month to display.

3. The caller has enabled the caller hiding function. However, it is important to understand that this feature is only available to people with special industry identities.

In fact, in today's era of such advanced networks, the first scenario is more likely. In particular, the number can be displayed normally when it is connected to others, but the display of this connection is unknown. At this time, the user should immediately think that this is the network**.

And for the network, you should also be more careful when answering, because this kind of **is likely to be fraud**or harassment**. If users are worried about missing something important**, they can choose to answer. Because today's mobile phones** are basically free to answer, and there will be no deduction for answering.

However, if the other person mentions money or personal privacy information in the conversation, you must be vigilant.

In addition, if the user finds that no matter who calls him**, it will be displayed as unknown. It is very likely that your mobile phone has not opened the caller ID. Generally speaking, no matter how cheap ** is, it is with an incoming call base display, but occasionally there will be cases where you accidentally do not choose to open it.

In this case, you can contact the operator's manual customer service to solve the problem.

As for the last case, the probability of occurrence is relatively small. The calling concealment service is not open to public users, and is generally only used for secrecy agencies or military personnel. And the possibility of this kind of person calling the ** scum is still very small.

The reasons for this question are as follows:

1. The caller ID is not enabled on the mobile phone number. If caller ID is not enabled, the phone will not recognize the caller ID. The caller ID needs to be enabled on the mobile phone to display the caller ID normally.

2. Mobile phone system problems. You'll need to restart your phone or factory reset it.

3. The mobile phone is infected with a virus. Need to kill the phone stupidly.

It's because you didn't turn on the caller ID, or you turned off the caller ID by mistake.

You can call** and consult customer service in detail.

The caller ID of the mobile phone "caller ID not displayed" is because the other party's number is hidden.

The caller ID is not displayed means that the mobile phone cannot see its ** number when the phone calls, and it may be that the other party has used the number hiding service, resulting in the other party not being able to display the number when the user dials **; It is also possible that the user has not enabled the caller ID function, which will also cause the caller ID to be unable to be displayed.

Introduction:

Caller ID service is a kind of service that can automatically enter the number and display it on the display screen of the machine, and can know the caller's number in advance.

"Caller ID" is also known as "Caller ID Display". It is divided into two types: one is the hang-up state, that is, when user A calls ** to user B, user B can receive the ** number and other information of the caller user A sent by the switch and display the ** number.

The other is the off-hook state, that is, when user A and B are on the phone, user C calls user B again, and when B hears the prompt tone, it can receive the ** number of user C at the same time, and B can select the call object according to the need.