1. Contact the telephone operator: First, contact the fixed telephone operator you use. You can call their customer service hotline or visit their official website. Ask them how to check whether the phone number has been cancelled.
2. Provide relevant information: The operator may ask you to provide some necessary information to verify your identity and the ownership of your phone number. You may need to provide your name, address, telephone number and other information.
3. Inquire about the cancellation status: Ask the operator whether the fixed telephone number you care about has been cancelled. They can query and provide corresponding information in their system.
4. Confirmation result: The operator will inform you of the cancellation status of the telephone number. If the phone number has been cancelled, they may provide more relevant details, such as the date of cancellation and whether there is a specific retention period. Please note that for different telephone operators, the specific steps to check whether the fixed telephone has been cancelled may be different. Therefore, it is best to contact operators directly or visit their official website to get accurate guidance and operation steps.