Support Cant Delete Thread(s)

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http://androidforums.com – Hi Guys, I've had my Samsung Galaxy S3 for approx 6 months now, and it has become laggy throughout the Text message app. I've been looking around elsewhere, and I've (now) set my limit to 500 messages per thread, however I have threads which I haven't cleared since I started, and some people I send upto 20-30 messages a day, everyday, so you can imagine how many messages I have in some threads. My problem is, every time I try and delete a thread, it doesnt do anything to delete a thread, but it will crash the messaging app - causing my to shut it down through the task manager, and res (General)