I found an app that helped delete all of my text messages. Even the thread that was 4000+ texts long. It's called "SMS Quick Delete." It lets you go through and select which messages in the thread you want deleted, so you could delete, say, 200 text messages at a time if you wanted. You can also delete the whole thread. It didn't seem to work with 4000 text messages but I used the app to delete 200 or so at a time until it was under 3000 and then I deleted the whole thread. I selected to delete the thread and went to bed (it still takes a while to do). I woke up in the middle of the night and all the texts were deleted! My messages run so much faster now!
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