Why can my Samsung a7 only receive text messages but not send text messages? The phone bill is more than 40, it's China Unicom's number.

If your mobile phone cannot send text messages, it is recommended that you check it through the following methods:

1. It is recommended that you change your mobile phone to see if you can send text messages;

2. If you can send text messages, it is recommended that you reinsert the card into your phone and send yourself a text message to see if you can receive it;

3. If not, it is recommended that you check whether it is a sim. Card problem;

4. Check whether the SMS center number of the mobile phone is set correctly.

If your problem still cannot be solved, it is recommended that you take your mobile phone card to the local business office for testing.