as long as you buy it from a authorized 3rd party retailer once the phone is activated you can take it directly to any Verizon corporate store just as if you had bought it directly from them.
True for service, yes. For exchange of new device within initial trial period, (or for *any* accessories), no. Those exchanges must be made through an authorized retailer if that is where you made the purchase - because you literally are buying from a different company w/ different distribution channels and - for accessories - different products.
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