Why can’t China Unicom mobile phone card send text messages?

Reasons and solutions for failure to send text messages:

1. There is a problem with the mobile phone short message center number setting. It is recommended to check whether the setting is correct;

2. If During holidays, the system is busy due to peak SMS sending volume. It is recommended to try again later or avoid the peak sending period;

3. The sending format is incorrect. If you send a text message to a foreign user, you need to add the international access code and country code before the number, plus the other party's number;

4. Check that the text message inbox and sending box are full;

5. Check whether the SMS function is activated;

6. Check whether the signal at your location is normal. If the signal is weak or there is no service, it may also happen that SMS cannot be sent.

If the above situation is eliminated and the problem still remains unresolved, it is recommended that you contact the manual customer service at your home location for processing.