Iphone 4 is 1 gig a month enough?

Ok so i'm thinking of getting the iphone 4, the deals perfect and all but there's only one problem. I only get 1 gig for a month. Now all i want to is, how much megabites does facebook, qoohme take to go on it/download it. And also what about downloading games how much megabites does that take. Or what if i connect to a Wi-Fi would that take gig away or what. Really would appreciate if you give me a good explanation for all this. My parents said 1 gig a month is nothing. So is it or isn't it?

Facebook usually uses about 20 megabytes per about 10 mins, and downloading off Wi-Fi takes about as much as the application space.

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