Random sms tones but no SMS

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http://androidforums.com – Recent new weird issue. I am hearing random text tones (sounds when you normally receive a SMS text) but there is no such text or alert icon in the phone or status menu. Even the alert led is not on. I keep hearing it, running to check, and nothing. Is this a bug? Service is Net10. Did incoming texts somehow get blocked but I get tones anyway? Only icon so far is the updated apps available store icon. Does this send text tones over and over? (General)