1. Mobile phone, fixed line telephone, and cable broadband are temporarily out of use but need to keep the number. At present, there are many disputes about the mobile phone downtime insurance fee, which attracts much attention.
2. Downtime number guarantee is a business of communication operators. It refers to the business that operators can reserve numbers for some mobile phone numbers, landlines, and broadband users who want to keep their numbers, as long as they pay a certain monthly outage number guarantee fee.
