1. What is a registration card?

A registration card is a normal mobile phone card, but it is usually a mobile phone card sold by a virtual operator. Because the price is relatively cheap, many customers use it to register accounts, such as Douyin and WeChat. However, sometimes the suitable number segment often changes, such as 162.165.167.170 and 171. In order to ensure the safety of the card, most registration cards can only send and receive messages, not make calls