Who I have the same questioned this topic

My notification settings for SMS and MMS messages appear to be ignored.  I have them set as an audio tone, I have the volume all the way up and I have the vibration set to 'long'.  When I get an SMS message, why do I only get a *very* short vibrate and no audio?

I have done this:

1) Open Messaging

2) Touch Menu --> Settings

3) Scroll down to Notification settings

4) Ensure "Notifications" is checked

5) Selected a sound in "Select ringtone" (I selected chirps)

6) Ensure "Vibrate" is checked (description says "Also vibrate when notified")

7) "Message alert repetition" is set to "Every 2 minutes"

😎 Ensure "Preview message" is unchecked

I never hear chirps, I never get repeat message alerts, I only get a very brief vibration.