How much would it cost to add a line to my sprint plan?

I'm interested in adding a line to my sprint plan and need some advice from other sprint customers. I currently have the everything plan (not the Simply Everything plan) and I want to add another line, I was going to get an iPhone 4s with the line but I was wondering how would that would change my current plan I have right now with sprint. Also, I was wondering how much I would have to pay with a plan for two phones? I was thinking of going with some plan with unlimited data and shared minutes because I rarely ever use my minutes.

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