Iphone question.. How much more would I have to pay a month if I already have the family plan?

I am due for and upgrade and I am interested in getting an iphone but first i'd like to know how much I would pay monthly for it. I already have a family plan 550min, unlimited texting, and the family data plan for an extra 10 dollars a month. Would I have to pay anything extra or could this all be included with it?Iphone question.. How much more would I have to pay a month if I already have the family plan?You wuld continue to share voice minutes and texting. You would drop the data plan and be required to get the $30/month iPhone data plan. Your costs would increase by $20/month.Iphone question.. How much more would I have to pay a month if I already have the family plan?30 dollars