Messages app isn't notifying me?

All of the sudden for the past two days, I won't get notifications on my iPhone 6s when someone texts me… It's so weird, my notifications are on, all of the options are on, and I keep not getting notified! It's bad because I won't realize that I've gotten a text until like a day later?! What should I do?

Go to setting of messnger. Always in the right top of the corner. Or gear logo. Find notification tab. On the notification. If that don't work. Go to your phone setting go to notification center find the option when the device is locked and choose show all notification

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