How to disable 3G on a iPhone 5?

I need to disable 3G on my iPhone 5 running ios 6.1.4.
I Don't want to jailbreak it.
My older iphone (3gs) had a option to disable 3G. Is there a app on the app store which will force the iphone to use 2G/EDGE? I really don't care if its a app… I really need to manually disable it instead of the phone "automatically" switching between 2G and 3G (Which decreases the battery and makes the phone very hot)
If any of you reading this helps me find a app from the app store or something else forcing the phone to use 2G instead of 3G, you will seriously help me A LOT. I don't know why they removed the option to switch between 2G and 3G… Anyways thanks.

Added (1). By the way, turning off cellular data won't disable 3G. Just turns off data… It still uses 3G for talking and text.

Added (2). The iPhone 5 doesn't have a option to disable 3G. It just has a option to turn on LTE and to disable/enable cellular data. They removed the option to disable 3G which is really stupid.

Go to the "settings app -> general -> Cellular" there's a slider there to turn off 3g or data all together.

Can't jailbreak 6.1.4 yet.

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