There is a plus sign before the number, so what is this number?

+indicates that the country code is omitted.

For example, +86 is the international area code for China.

The mobile phone number used in China is 1 1 digit, and each segment has a different coding direction: the first three digits-network identification number; 4th-7th digits-area code; Number 8- 1 1- user number.

Security issues:

The mobile phone number is the login name. As long as you bind the mobile phone, you can also tell you intimately whether this mobile phone is registered for Taobao or Alipay. Don't know the login password? If you forget your password, the system will also tell you what to do. All you need is a mobile phone verification code.

In other words, as long as you have your mobile phone number, your account number and password.