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What does Unicom mean by sending a text message showing rejection?

Unicom number can't send SMS, so the following troubleshooting is suggested:

1, the cell phone signal is guaranteed to be normal.

2. Confirm that the number sent is correct.

3. Ensure that the number is in normal state (it cannot be sent when it is turned off).

4. This number needs to be enabled with SMS function.

5. The SMS center number is correct (whether it is correct can be confirmed with the local Unicom customer service hotline).

6. Under the condition of eliminating the above faults, the machine card exchange test can be carried out. If the replacement is normal, it means that it is a mobile phone problem. It is recommended to contact the mobile phone after sale; If you still can't send it after changing the machine, it is recommended to contact the local Unicom customer service hotline.