What does it mean that there is a little moon on the left side of Iphone SMS?

The little moon appeared because you opened the do not disturb mode. As long as do not disturb mode is turned off, the moon icon will disappear.

The closing steps are as follows: 1. Open the settings for iPhone.

2. After entering the page, find the column of "Do Not Disturb Mode" and click it.

3. Just turn off the "do not disturb mode" button after entering.

Do not disturb mode is a very user-friendly setting, which belongs to the notice column. It is also mainly set in the notification options. Click the notification to enter, and you will see relevant options under do not disturb mode. When Do Not Disturb mode is enabled, the moon icon will appear in the status bar at the top, and incoming calls and reminders will be set to mute.

20 12 In the early morning of September 20th, Apple officially released the iOS 6 operating system update on iPod, iPhone and iPad devices. On the mobile phone, the newly launched Apple iOS6 adds "Do Not Disturb Mode" to prevent users from being disturbed by incoming calls and notifications, and provides the options of "reply message" and "remind me later" when rejecting incoming calls.