Why does Moqu calligraphy not exist?

There may be the following reasons why Moqu calligraphy shows that the mobile phone number does not exist:

1, generally speaking, your number is not in the service area, and there is no signal. The number does not exist. The first is the mobile network error. Shut down and restart or call customer service.

2. The number has been revoked by the mobile network operator.

3. There is something wrong with the number of digits, which does not meet the requirements of digits, or the wrong number is entered.