Why can't Samsung E 120L use Unicom card to send messages, but only mobile card? What's up

Samsung E 120L is a Unicom mobile phone. It is normal to send text messages with Unicom card. If you can't send SMS with Unicom card, please check whether the following situations occur:

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

2. If the SMS center number is not set or set incorrectly, just reset it;

3. The signal is weak, there is no signal or the battery of the mobile phone is insufficient, resulting in the information not being sent normally;

4. Because the system is busy, especially during the peak period of texting on holidays, it is suggested that you try again later or avoid the peak period of texting;

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;

6. SMS sending and retention is valid for 24 hours;

7. Whether the SMS inbox and sending box are full;

8. I suggest you restart your mobile phone or change it for a test.

In addition to the above simple troubleshooting, it can't be solved. You can contact the manual customer service for processing.