Sending SMS failed.

1. When the airplane mode is turned on, all signals are blocked by the mobile phone, and the short message sending fails. Check whether the flight mode is on and off.

2. Check whether the cell phone signal is normal and stable. If the cell phone signal is weak, take the cell phone to a good place to send a text message again.

3. Check whether the mobile phone is in arrears. If it is arrears, it is recommended to resend the SMS after the payment is successful.

4. Avoid the busy network period, which is usually the peak of network usage such as commuting, holidays and the early morning of system server upgrade. If you can't send SMS during the busy network, please try again later.

5. Call the operator's customer service and set the center number of the SMS to see if there is anything wrong.

6. Check whether the entered mobile phone number is correct. If the input is wrong, it will lead to the failure of sending SMS. At this time, correct the mobile phone number and send a text message again.