Can I successfully send SMS delivery report when my mobile phone is not turned on?

Opening the SMS delivery report is just a function, which can let you know whether the SMS has been successfully delivered to the other party's mobile phone. However, the sending of SMS does not depend on whether the delivery report function is enabled on your mobile phone. When you send a short message, the mobile phone will send the short message to the operator, and the operator is responsible for sending the short message to the receiver. Turning on the delivery report only adds a feedback mechanism in the process of sending SMS to let you know whether the SMS has been delivered successfully.

Therefore, even if you don't open the delivery report, as long as your mobile phone signal is normal and there is no fault in the process of sending the short message, the short message will still be successfully sent to the receiver.