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I suggest that you try to repair the phone software using PC Companion..
Before repairing your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?
If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.
Before you try the software repair,try the following: settings-apps-all,look for messages app,force stop and clear data. After this,disable the app. Restart your phone and follow the same path,enable back the app.
Glad I can help,but let's hope it works without a repair.
Ok,keep us updated. Sorry for the issues.
So the SMS is still there? The repair should have erased everything.