How much does the iphone 4 cost per month?

My sister said that if i can keep a cheap budget on the a phone i can be added to her account. So i want the iphone 4 with the cheapest data package. How much will this cost per month. I already have the iphone but i just need to know how much it will cost for the data.

Added (1). I will be using Verizon Wireless. And i want the least amount of data possible

It depends on your carrier. I have AT&T, and it's a $30 monthly data plan for 3 GB.

It really depends on how much data you want, not so much on the phone. If anything, it's as simple as a call to customer service. They'll help you out for sure

Well what I see on the computer the price per month is $30 I think that is a really good price per month but the price for the real phone I do not no

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