1, confirm whether there is a network, and suggest you use it where the signal is strong;

2. Check whether there is any phone bill in the account. If the balance is insufficient, it needs to be recharged before it can be used;

3. Confirm whether the parameters of the mobile phone have been set. If Unicom 3G mobile phone is used, the parameters of Unicom 3G mobile phone are set as follows: APN access point: 3gwap (regardless of case), user name and password are empty, gateway/agent address:10,0, 172, port number: 80;

4. Check whether the USIM card is inserted. If it still doesn't work when plugged in, I suggest you go to the local Unicom's own business hall to check whether the USIM card is faulty or not.

5. Check whether there is anything wrong with the mobile phone. I suggest you change the machine for testing.

If your mobile phone can't send short messages, you can try to restart or change your mobile phone for testing to see if the following conditions exist:

1. SMS center number is set incorrectly;

2. No signal or low battery;

3. The system is busy during the peak period of holiday SMS sending. We suggest you try again later or avoid the peak period.

4. The sending format is incorrect. If you send a short message to PHS users, you need to add the area code before the number;

5. The short message sending time exceeds 24 hours;

6. SMS inbox and outbox are full.

7. Inquire whether the SMS function is enabled, and contact the local manual customer service for processing;

If the above reasons cannot be solved, you can contact the local manual customer service or go to the business hall to be handled by the staff.