What can send text messages to callers is called empty Android system. Why?

1, is there any software (such as 360 mobile guards, QQ housekeeper, Kingsoft guards, etc.)? ) the one who turned on the phone interception function? If there is, cancel it. 2. Or call forwarding is started, and the call is transferred to another phone, and the transferred phone is just an empty number. You can go to "Call Settings-Call Transfer" first. If call forwarding is set, just cancel. -Enter ##2 1# on the phone, and then press the key to try it. If not, go to Settings, Call Settings, and transfer all cancelled calls.