How is it that mobile phones can't send short messages online?

1, check whether the signal is normal;

2. Whether the number card is in arrears;

3. Whether the data access function is turned on;

4. If the above three items are normal, you can switch on and off the machine again, change the machine and change the card for testing;

5, still unable to access the Internet, you can call the local customer service hotline for consultation.