Shulou(Shulou.com)05/31 Report--

Audio commentary

Hello, everyone. The meeting will answer your questions. Mobile phone traffic but the network can not be used what is going on, mobile phone traffic can not be used this is what many people do not know, now let's take a look at it!

Answer:

1. There may be something wrong with the local network. You can call local 10086 for feedback optimization.

2. change the phone test. If it can be used properly, there may be something wrong with the phone. You can contact the phone number for after-sales consultation.

3. If this situation still exists after changing the mobile phone, there may be something wrong with the SIM card, you can take the card to the nearby business hall for testing.

4. Introduction of SIM card:

5. SIM card is the user identification card of digital cellular phone, and its full name is "user identification module". In GSM digital mobile phone system, SIM card plays an extremely important role. It is not only an important part of the mobile phone, but also the ID card of every GSM mobile phone user. Therefore, the SIM card realizes the idea that you can recognize others without recognizing the phone. Mobile phone and SIM card together constitute mobile communication terminal equipment; whether it is GSM system or CDMA system, users of digital mobile phones will get a SIM card when they access the network. SIM cards are also called smart cards or user identification cards, and digital mobile phones can only be used after installation. SIM card is a kind of built-in large-scale integrated circuit card, which stores the information of digital mobile phone customers, encryption keys and other contents. The network can be used to identify customers and encrypt the voice messages of customers. The use of SIM card completely prevents the eavesdropping of parallel phones and calls. SIM card production is carried out in strict accordance with international standards and norms to ensure the normal communication of customers. There is no SIM card installed, you can only dial 11112 and other emergency numbers. The application of the SIM card in the system separates the card from the mobile phone, and the SIM card uniquely identifies the customer; the SIM card can be inserted into any mobile phone, and the communication expenses generated by the mobile phone are automatically recorded in the customer account uniquely identified by the SIM card; the SIM card adopts a brand-new single-chip microcomputer and memory management structure, so its processing function is greatly enhanced. The logical structure of its intelligent feature is a tree structure; all the feature parameter information is represented by data fields, and there are three types of data information in the SIM card: first, the information related to the cardholder and all the business information that the SIM card will provide in the future, this type of data is stored in the root directory; second, it is the only information in the GSM application, and this kind of data is stored in the GSM directory. Third, the information used by GSM applications can be shared with other telecom applications or services and is located in the telecom directory.

This is the end of this article. I hope it will be helpful to all of you.

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