G6 can only receive short messages, but cannot send short message error code 330.

1, there is something wrong with the mobile phone itself. (If the call is normal, it can be ruled out)

2. The number of SMS center is set incorrectly. (Check and confirm by yourself)

3. The operator has not enabled or restricted the SMS function. (Unlikely, if you can receive the text message, you can rule it out, otherwise call the operator's manual station to confirm. )

Checking the above points item by item should solve the problem.