Okay, if you want to stick with Verizon, then you need to buy a wireless USB modem and a data plan.
A $50 monthly data plan will get you 5GB of data. For $80 per month you can get 10GB of data. Those are your only choices.
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/www.verizonwireless.com/b2c/store/controller?item=phoneFirst&action=viewPlanList&continue=true