Messages not working after iOS 6.0 upgrade

Hi, I've been experiencing Messages and WhatsApp issues since upgrading my iPhone 4S to iOS 6.0 last week. WhatsApp refused to sync with my phone book even after I switched it on and off in privacy setting and even resetting all phone settings. This issue was finally resolved when I reinstalled WhatsApp. But Messages still shuts down every time I tried to send a new message. I can still receive and reply to messages. I was told reinstalling iOS 6.0 will solve the issue. Is there a way to do that over the air instead of having to connect to iTunes, please? Thanks much

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