The ringtone of the Iphone's own SMS stopped ringing!

1 and iPhone6 phones are not turned on in silent mode, but they are still set to ring mode, but there is no sound when the incoming call rings, which proves that the ring should not be turned off.

2. You can click Settings-Sound, and then in the sound settings, see if the ringtone and reminder are zero, so that even if the system sets the ringtone, as long as the ringtone size is not set here, there will be no ringtone.

3. It's best to turn on the function of "adjusting with keys" in the sound, so that you can use the volume keys to adjust the sound of ringtones and reminders.