Why didn't Apple 6s plus receive a text message with no sound?

There is a mute button on the left border of the mobile phone. Is it open? Turn it off. If not, set the interior, notify the sound, and click in to see if the sound is set.

1. First of all, we need to check whether our iPhone6 is currently mute. If so, press the first button from top to bottom on the left side of the phone.

2. If the mute is not turned on, let's turn on the settings on the desktop and find "do not disturb mode". After entering do not disturb mode, let's see if "Manual Start" is turned on.

3. If the manual startup item is turned on, we need to turn it off here so that the short message will ring.