There is a moon sign next to Apple's mobile phone. What does it mean to send text messages on Apple's mobile phone?

The small crescent logo represents that Apple's mobile phone is in do not disturb mode, as shown in the following figure:

Closing method:

1. Open the settings and find do not disturb mode.

2. Turn on "Do not disturb mode" and find that the switch of "Do not disturb mode" is on.

3. Turn off the "Do Not Disturb Mode" switch, and the "Crescent" sign in the upper right corner of the phone will disappear.