What will resetting the network settings on an iPhone 4S do?

My imessage has been messing up a lot lately, and something I read said I Gould turn off iMessage and then reset network settings. I want to try it, but I'm worried because I don't know exactly what it will do.

Can someone tell me?

Network settings is like, Remembered Wi-Fi networks, Browsing history, Website data etc. I don't think it has anything to do with iMessage. How is iMessage "Messing up"?

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