I can't see the number when my cell phone calls. What happened?

Various possibilities of displaying "unknown number" on mobile phone.

1, caller ID function is not enabled.

If all the incoming calls you receive show "unknown number", you can basically conclude that you have not enabled the caller ID function.

Not turning on caller id means that everyone will display "unknown" when calling you; Moreover, once you miss the call, you can't call back to the other party. Therefore, it is very necessary to turn on the caller ID.

2. The other party has opened the "call hiding" service.

If the caller ID is turned on, there is still an "unknown" caller ID, which may be that the other party has opened the "call hiding" service.

Calling number hiding refers to the business that the calling number is not displayed to the other party when the user calls. Generally speaking, after the user opens this service, he calls someone else's phone, and the other person's phone will not display the number or record it.

However, this function requires users to bring their ID cards to the business hall, which is generally not open to ordinary people.

The other party used special software to hide his number.

When the caller ID is turned on, the caller ID is still "unknown". It is more likely that the other party used special software to hide his number, which is generally displayed as "unknown number" and "private number".

Extended content: caller ID

Caller display service is a service that can automatically display the caller's number on the display screen of the phone, and can know the caller's phone number in advance.