My iPhone 5S (iOS 9.2) is having the following problem: it can receive text messages and iMessages as normal, but when I view them my phone vibrates constantly until I stop viewing them, and moreover it doesn't consider the message to have been read. So far, my only attempt at fixing this is turning it off and back on, but this hasn't helped.
(Possibly related: over the last couple of days, apps have been quitting very frequently. I only bring this up because prior to the last two days, I've had no problems with my phone.)
Best Answer
There are a few more things that you can try to perform.
If these two options doesn't resolve your problem. You can ask assistance in a Apple Store center because clearly this is a problem the shouldn't occur.