What happened when all the numbers displayed on Apple's mobile phone became unknown?

1. It is possible that the caller ID function is turned off. It's not the phone. You can call your own number operators, such as Telecom 10000, China Unicom 100 10, and Mobile 10086. Select Manual Service to see if the caller ID function is turned on. Call reminder is not a function of mobile phone. Users can directly call the operator's customer service and turn to labor, and request to open the call reminder function, which is charged. After opening, when the phone is turned off and there is an incoming call, the operator will record it and wait for the phone to be turned on to notify the user by SMS.

2. It may be that the mobile phone card manufacturer canceled the roaming fee, thus charging the caller ID fee.

3. Because of the caller, what software does the other party use or block his number?

4. VoIP software calling.

5. The calling number has applied for "Calling Number Display Restriction".

1. Calling number display refers to the service function that the system can provide and display the phone number of the calling party to the mobile phone customer as the called party. Through this service, customers can decide whether to answer the phone according to the displayed calling number before answering the phone, and can also inquire or dial the received and missed phone numbers.

2. If the other party dials your number but it doesn't display normally (display "confidential call", "unknown call", "no number", "unknown", "private number", "special number" or-P-,etc. ) or the number display is incomplete, which may be due to the following reasons: 1. The calling number applied for the "calling number display restriction" service. This function can realize that the calling number is not displayed on the called user terminal when the calling user calls.

2. Please log in to the mobile online business hall to check whether the caller ID function is turned on;

3. Special VoIP or international long distance call.