No SMS notifications for one contact I have a weird problem. For this one contact I don't get any sound or vibration notifications when a SMS arrives.

What I have tried:  


Change Text Tone
Change Vibration
Delete contact and create new with same mobile number
Rebooted iPhone


What could be the problem?
You may have accidentally muted the SMS conversation.
To change this go to the SMS messages for that contact and click Details (top right) and make sure that Do Not Disturb isn't selected.