Support Message Notification but no Message?

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http://androidforums.com – If any one knows how to fix this it would be great. My Samsung Galaxy S2 keeps making message notification noise even though there are no messages or no emails, please help me why this happening... i tried everything but it doesn't stop... its not rapidly happening but about every 30 minutes it makes message notification noise... help me why is this happening? Not sure if this matters but my phone has been flashed from sprint to metro pcs. (General)