What's the best network for iphone5 for data?

I'm currently on a plan with vodafone for 250 MB of data a month with free all network texts for 20 euro a month. I got an iphone a few days ago and already my 250MB of data is gone and i have no credit left and don't know how it all went. I use the Wi-Fi when i'm at home and i use apps like facebook and snapchat alot. I can't afford spending so much on credit and then it just being eaten away so which plan is best for an iphone 5 on any network on pay as you go?

I would recommend upgrading the data plan because Apple's iPhone apps use a lot of background refreshing. I'm on AT&T's 3GB plan and I use around 75% of it. I usually get on Flickr (which is a lot of images) and Instagram daily for about 30 minutes each. So it's just about what you think will fit you.

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