There are always SMS reminders in the middle of the night.

Hello, landlord, if your notification ringtone is an application notification and you can't find any application, in this case, your mobile phone management software will generally block your mobile phone application. It is suggested that the landlord use the mobile phone housekeeper to scan the software in the mobile phone, and then see if there is any advertisement push, even the permission to push, and so on. Push some useless software, such as turning it off when it is not often used. Then try again and see if you can hear the notification sound. Be sure to find out which software sent it, and then ban his application message push permission, so it should be solved. If the mobile phone housekeeper can't be found, the landlord can check which applications are still pushing messages in the application settings. If the above methods have not been solved by the landlord, it is suggested that you can back up the important data in your mobile phone and then restore the factory settings of your mobile phone, so that it can be completely solved.