I have 8000 messages in 1 thread, 7500 messages in another thread, and 4800 messages in another thread. Whenever i try and send a message now, it takes roughly around 2 minutes to send ONE text message. I think this is because of how many messages i have. But the problem is - My phone crashes whenever i try and delete one of these threads. I tried deleting the messages, then leaving it on over night to delete them all, but when i woke up, my phone was just regularly at the home screen with none of the messages deleted. How do I delete all these stupid messages?