My Xiaomi 1s Youth Edition can't send a message when plugged into Unicom card. Set the correct center number prompt (as shown below)

Hello, the mobile phone can't send short messages for the following reasons:

1. SMS service is not enabled on the mobile phone. You can call 100 10 to contact customer service or activate this function in the local business hall.

2. No or wrong SMS center number is set, just reset it.

3. The signal is weak, there is no signal or the battery of the mobile phone is insufficient, which leads to the information not being sent normally.

4. Because the system is busy, especially during the peak period of texting on holidays, I suggest you try again in the future or avoid the peak period.

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