Will updating to iOS 7 delete text messages?

I know I'm late updating and all but I haven't had this phone long, since I replaced my old one, but I have an iPhone 4 and I'm planning on updating to the iOS 7.0.4 that is available. I have text messages that I've kept for a while because of information or I'm too sentimental for some to get rid of them (yeah, judge me) but I don't know if updating now will delete those (I'm hoping not). Also, will it delete my contacts? I hear it has for some people.

No it'll keep all your text threads and contacts as long as you have it backed up to your computer or the icloud

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