This needs vigilance, and it must be properly kept. Personal mobile phone password is extremely important, so don't easily disclose the mobile phone service password to others, otherwise it will lead to risks.

Mobile phone service password and its function;

1. The maintenance password of ordinary mobile phones is indicated in the mobile phone maintenance manual. Different brands of mobile phones have different "service passwords". The service password of general brand mobile phones is "12345" or "0000". If it is a new mobile phone, the service password is in the number card you bought.

2. When querying bills or detailed lists, you need to provide a password. No password, unable to query. In other words, without the service password, you can't know exactly where you spend it.

3. If the mobile phone is dropped, in order to prevent your phone bill from being consumed by others or your mobile phone card from being used to deceive relatives and friends, you can stop all the services of this card by providing the service password until it is turned on, so you don't have to worry about the card being used by people with ulterior motives.

4. If you think the brand of mobile phone card you are using now (GSM, M-Zone, Shenzhouxing) is too expensive or inappropriate, and you want to change the brand, you must provide the service password.