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I have an 16GB iPhone 4s and I got iOS 7 and it says under my usage that my messages are taking up 4 GB. So I went to delete conversations, and it still says that they're taking up 4 GB. I went to text someone and when the conversation came up it was still the full conversation we've been having since last time I deleted them god knows how long ago.
How can I free up space without having to go through and delete every single little message (which would take hours)???
I'm having the same exact problem, seems that this is some bug with the new update.