How to check the mobile phone number? How long did it take?

Taking China Telecom's mobile phone card as an example, the method for inquiring the service time of the mobile phone card is as follows:

1. Open the "Telecom Business Hall" APP in your mobile phone:

2. Open the application, log in according to the prompts, then find "My" in the lower left corner of the page, and click the mobile phone number in the page:

3. Click "Number Information" in the opened page:

4. In the number data that has been opened, you can view the information such as the access time and age of the calling card: