What the hell is this? I haven't sent it either.

Hello, 106589967000 is the code of China Mobile for filing. The information sent by your mobile phone is used for archiving and storage. Usually the reason is that an application of your mobile phone automatically triggers. You can view the application permissions of your mobile phone software. Under normal circumstances, the application authority of SMS and call can be completely turned off, or it can be turned on as appropriate.

Setting method: Go to Security Center-Authorization Management-Application Permission Management, and check that the SMS permission of those softwares is open, just close it directly.