What is a white list of mobile phones and why?

Many people know that mobile phones are blacklisted, but do you know that mobile phones also have whitelists? So what does the white list in the telephone address book mean? Let's introduce Bian Xiao to you in detail!

1, the phone in the white list, no matter whether your mobile phone only receives the phone from the address book or directly blocks everyone's phone, the phone in the white list can always call directly and won't let you miss it;

2. After the white list mode is enabled, only the numbers in the white list can be dialed, and other numbers cannot be dialed;

The above is an introduction about what the white list of mobile phone address book means. I hope the above introduction can help everyone!