What does the imaginary sign mean?

Virtual numbers are special phone numbers. The literal meaning of virtual number is virtual phone number. This number is not a real landline number or a real mobile phone number. It is a special telephone number, but it has the function of an ordinary telephone number. After configuration, a mobile phone or landline can call this number, not only to answer the phone, but also to make a phone call. Virtual number can be used for telephone, SMS, software registration, overseas Internet access, Taobao shop use and other functions. Because of its anonymity, virtual numbers can also be used for some special purposes, such as short-term rental, spam and so on. The operation of virtual number is relatively simple, and only a little personal information is needed. Moreover, virtual numbers can be temporarily registered, purchased, switched, etc. As needed, this means that it can operate freely and flexibly as needed.