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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