Sending SMS failed. User information is empty.

You can check whether the message sending report of the mobile phone is turned on.

You can check whether the message sending report of the mobile phone is turned on and set this function to off. If it is caused by sending a certain amount of short messages in groups, the short message function is generally restricted in the operator's office. You can call the corresponding customer service to explain the situation and then cancel it, and then you can resume.

Delete some short messages in your mobile phone to avoid the memory of your mobile phone being full, restart your mobile phone, and then exchange mobile phone card tests with your friends.