Do I have to reactivate and iPhone if I reset it?

I have an iPhone 4S, if I reset it by the settings in the phone itself do I have to reactivate it because it's CDMA or will it do it by itself

No don't reset it just turn it off at the top (hold the lock bottom for about 6secs) and it should come up with slide to turn off do that then wait a bit then do the same thing you done to turn it off and it will come up with an apple
MAKE SURE you KNOW YOUR SIM!

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