How Should I Choose a PIN?

PIN code (PIN1), the full name of Personal Identification Number. Is the personal identification code of the SIM card. The PIN code of the mobile phone is a security measure to protect the SIM card and prevent others from stealing the SIM card. If the PIN code is enabled, you must enter a 4 to 8 digit PIN code after each boot. ^[1]

PIN

PIN code (PIN1), the full name is Personal Identification Number.

It should be noted that if the PIN code is entered incorrectly three times, the phone will automatically lock the card and prompt for input

You can go to the service provider of the SIM card, that is, the lobby of the mobile or China Unicom, and ask them to help you solve it, but this is more troublesome. I am here to tell you a simpler and faster way to unlock mobile phones ^{[5] [7]} , as follows:

1. Log on to the online business hall of the operator.

2. Enter your mobile phone number in the upper right and click Go to link to the online sales office in the area where your mobile phone belongs.

3. Enter the mobile phone number, service password and verification code to log in.

4. In "Personal Information Management", click "SIM / PIN / PUK code query", you can see the PUK code corresponding to your mobile phone.

5. Enter the corresponding PUK code on your phone to unlock the SIM card. ^[7]

About how China Unicom mobile phone users can check the PIN:

1. The mobile phone card holder of the new account user has printed the word PIN code initial value 1234, whichever has not been changed shall prevail.

2. If you have forgotten the PIN code or the old user has discarded the card tray after the change, you can go to the local business office to check with a valid ID.

3. When the user s mobile phone card is accidentally locked, the user is prompted to enter the PUK code, and the user does not need to go to the business hall to unlock it. Now, simply log in to the portal with the locked number to unlock it easily. ^[8]