What are the reasons why a mobile phone has an empty number?

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There are several reasons why the mobile phone number is empty: 1. The number has been canceled or deactivated. The user may apply to the operator to cancel or deactivate the number; 2. The number has expired. If the number is not used within the period, the operator may The number will be considered invalid and logged out, etc. This topic provides you with relevant articles, downloads, and course content for you to download and experience for free.