How to share iPhone 3G on PC?

Please note I have iPhone 4S and it's running on iOS 7.1.2 so old settings may not work.

It's very easy to set your iphone into a hotspot.Step 1: Tap Settings on your iPhone, then General. You should see Personal Hotspot in the list just as the following picture. It looks very similar no matter your iPhone is iOS 4 or iOS 5. Step 2: Click Personal Hotspot and you'll see a screen as below. Just need to click screen and switch to ON status. After that, type in a network name for the hotspot and configure the Wi-Fi password to avoid other users.
You can see how it works with pictures from here, http://www.mywifirouter.me/blog/how-to-turn-iphone-into-personal-wifi-hotspot-device/

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