Totally clean install of ios 11 on iPhone 6S

I want to completely reinstall iOS 11 on my iPhone 6s.
How do I do this?
Yes. I don't care about any old data on my iPHone.
Don't need it.
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JohnBusiness Consultant (Owner)Commented:
IOS is in the phone firmware section and does not take up the data section.

All you can do is Reset.  Settings, General, Reset, Reset ALL settings. Then update the IOS.
Qian BaoDigital Media Specialist and Web DesignerCommented:
You can also do that in iTunes. Just connect the iPhone to the computer with iTunes and go the device page. Click on restore and iTunes will download the newest version of iOS (iOS 11.3) and install it on your iPhone. All previous contents on the iPhone will be erased. This method guarantees that you are on the latest iOS.

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