Does it cost to upgrade with verizon?

I have a samsung stratosphere. It is just my mom and I on the plan. I want an iPhone. Our plan is not up until December of this year (2013). My mom has never upgraded her phone, she's not really into the smartphone stuff. Since she has never upgraded before, could I take her upgrade? She will probably never get an upgrade. I was probably just going to get a plain iPhone 4 because it would be free. Does it cost money to upgrade?

There's a $30 upgrade fee with any Verizon device. You can definitely use her upgrade, tho

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