What does it mean to cancel the credit outage guarantee service after three days?

official tips from operators. Downtime number protection is a service of communication operators. When the number protection service is coming to an end, a short message will be sent to inform them. Downtime number protection refers to the service that the operator can keep the number for some users who don't use the mobile phone number, fixed telephone and broadband for the time being, but want to keep the number, as long as they pay a certain monthly downtime number protection fee.