There are several reasons for this restriction:
1. Calling card sending is bound to the mobile phone number: the calling card is sent by the mobile phone number, and the telephone operator will send relevant information according to the user's mobile phone number. Since the mobile phone number is the unique identification of the user, the user cannot directly cancel or unsubscribe the calling card.
2. Restrictions of relevant laws and regulations: In some countries or regions, telephone operators are obliged to provide users with some necessary value-added service information, and calling cards may be one of them. Therefore, telephone operators may not be able to provide the option of unsubscribing according to the requirements of laws and regulations.
It should be noted that although users cannot directly unsubscribe from calling cards, they can reduce or avoid receiving these messages in some ways. For example, you can contact the telephone operator and ask if there are any related services that can be closed or restricted to send calling cards; Or filter or filter the calling card in the phone settings.
Extended content:
In addition to calling business cards, there are other similar value-added business information, such as SMS advertisements and promotional information, and there may be similar restrictions on unsubscribing. This is mainly because the sending of these messages is bound to the mobile phone number and is restricted by relevant laws and regulations. In order to better protect users' privacy and information security, some countries or regions will also introduce relevant policies, requiring telephone operators to provide users with the option of receiving or rejecting such information. Therefore, users can choose an appropriate way to manage and control the reception of these value-added business information according to their own needs and the provisions of laws and regulations.