If i update my iPhone 4S to latest version will the contacts gets erased?

If i update my iPhone 4S to latest version will the contacts gets erased? I have not taken back-up of the contacts!
I dont have an Outlook to take back-up. Is there any other means to back-up?

Hi there,
While the iOS updates aren't designed to erase your information, it is always a good idea to back up your information just in case the process doesn't go too smoothly. Take a look at the article below for information on how to back up your device to iTunes as well as some information on what gets backed up. I've also included an article that goes over how to update your device once you do have it backed up.
iOS: How to back up
http://support.apple.com/kb/ht1766
iOS: How to update your iPhone, iPad, or iPod touch
http://support.apple.com/kb/HT4623
Hope that helps,
Griff W.

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