How to have 3G on all the time on iphone?

I'm in with vodafone and I hardly ever get 3G.
I have noticed when I do get it, I'm only on one bar phone signal, and when I'm on E (which is painfully slow) I have full bars. I would rather one bar and 3G all the time tbh because I'm paying £25 a month for a phone that I'm using like an iPod. I want to have 3G all the time, on my old blackberry there was an option for this.

Assuming you have ios7 installed, swipe up from the bottom of the screen and deselect the Wi-Fi icon which will turn it off and switch to 3G. (If less than ios7 go to settings, Wi-Fi, and slide the Wi-Fi slider to the left to turn it off)

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