What does the intranet SMS monthly fee mean?

This situation refers to the monthly fee for sending text messages to a mobile phone number of the same operator as the mobile phone card.

The monthly fee for in-network text messaging is a fee for mobile phone services. It refers to the fee that users need to pay when sending text messages. If the user is using a China Mobile mobile phone card, then when sending text messages to other China Mobile mobile phone numbers, he or she will need to pay the corresponding intra-network SMS monthly fee. These fees usually vary according to different packages and service content, and users can choose a package that suits them according to their needs.