How to set up iphone 5 Wi-Fi and 3G?

I got the iphone 5 and want to set it to use Wi-Fi whenever possible and only use 3G when Wi-Fi is not available

How do i do that?

Also what do all the options under 'cellular' mean and what's best to do with them?

You can only use WI-FI if you are near a strong internet connection hotspot

Go to the settings and click on the Wi-Fi option, just scroll that to the off button. It usually justs go to your 3G once the Wi-Fi is off

If you go to: settings, Wi-Fi -you can join your Wi-Fi network. If you are not connected to Wi-Fi, it will automatically use 3G.

For cellular settings, it is best to keep them as they are.

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