Does 172 start with an imaginary number?

According to the inquiry of Shenka. Com, virtual number refers to the additional number provided to users through virtual number service providers, which can be bound with the user's real mobile phone number. Virtual numbers can be used for short messages, telephone calls, voice verification codes and other communication modes, and have certain functions of protecting users' privacy. Among them, the virtual number beginning with "400" is mainly used for corporate customer service calls and belongs to the charging number. The virtual number beginning with "800" is a toll-free number, which is usually used for after-sales service of enterprises. 170, 17 1, 172, 173, 175, 176.