How much per month would an iphone cost me?

I'm on a family plan with At&T and we have unlimited texting. How much would internet cost? (limited and unlimited) Also please explain 3G and 4G to me? I don't understand what that is… Does it cost extra?

Htc one x

AT&T currently offers a few data plans with the iPhone
300mb for $20 a month
3gb for $30 a month
5gb for $50 a month
AT&T does NOT offer unlimited data plans any longer

the iPhone is a 3g phone, most of the newer phones are 4g, but the iPhone is not one of them.

I have Verizon so it may be different but for me it's 10$ a Gb of data, which is pretty good because I used 907mb which is under. 3G and 4G are what you use to serf the Internet when you do not have Wi-Fi. 3G is slower but it's what I use because my phone doesn't have 4G because it is the lOwer model of iPhone.Id say 10$ a month, maybe 20$. For a ton of data, maybe 1000 YouTube videos or so.

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