Why is the sim card locked?

The SIM card will be locked mainly because the PIN password has been entered incorrectly more than three times, so the SIM card will be automatically locked. At this time, if you know the PUK password, you can enter it. Once it is correct, you can unlock the SIM card. If you enter the wrong code ten times in a row, the SIM card will be permanently locked and automatically scrapped.

The operating environment of this tutorial: MIUI12.5 system, Xiaomi 11 mobile phone.

Why is the sim card locked?

The PIN code is a personal identification password, and the unified initial password is 1234. After purchasing the card, you can refer to the mobile phone manual to activate it, or you can modify it yourself.

But if the PIN code of the SIM card is enabled, the phone will be locked if the incorrect PIN code is entered three times in a row after turning on the phone, and a PUK code is required to unlock it.

You can go to the business hall to unlock it for free, and the password after unlocking will still be the initial password 1234.

PUK code is the unlocking password of PIN code. When the phone PIN code is locked, enter the PUK code to unlock. If the wrong code is entered ten times in a row, the SIM card will be permanently locked and automatically scrapped.

Introduction

The SIM card is a subscriber identification card for digital cellular mobile phones. Its full name is "Subscriber Identification Module". In the GSM digital mobile phone system, the SIM card plays an extremely important role. It is not only an important part of the mobile phone, but also an identity card for every GSM mobile phone user. Therefore, the SIM card realizes the identification of people. machine concept.

Mobile phones and SIM cards together constitute mobile communication terminal equipment. Whether it is a GSM system or a CDMA system, digital mobile phone users will get a SIM card when they "connect to the network".

SIM card is also called smart card or user identification card. Digital mobile phones must be installed with this card before they can be used. A SIM card is a card that contains a large-scale integrated circuit inside. The card stores digital mobile phone customer information, encryption keys and other contents, which can be used by the network to authenticate the customer's identity.

For more related knowledge, please visit the FAQ column!

The above is the detailed content of Why is the sim card locked?. For more information, please follow other related articles on the PHP Chinese website!