Does Apple charge for sending messages to filter receipts?

Apple users can send iMessage for free as long as they have a network. Send as SMS: When the iMessage information is unavailable, it will be automatically sent as SMS, and the operator may have to pay the SMS fee.

There is a filtered receipt in the Apple SMS. For the service subscribed by the called user, after subscribing to the service, the user can set the short message filtering conditions according to the calling number, time period, keywords, etc., and the short messages that meet the filtering conditions will be automatically filtered by the system.