Why did the iphone SMS record suddenly disappear and I couldn't send it out?

What happened to me yesterday morning was that I quit as soon as I entered the SMS page (other software can do it), and I was in a hurry. Later, I learned that it was because of the conflict of installing software. I used the "9 1 assistant" white apple repair tool (from the "system maintenance" of 9 1), and both options were pressed, which was no problem. Last time I installed a real white apple with a theme, and I ordered this white apple repair.

I hope I can help you! If it is not S, it may be that the permissions of ms's db are incorrect. Delete sms.db under/private/var/mobile/library/SMS, and then restart the iphone. If you want to keep the short message content, it should be possible to change the permission of that sms.db to 777.