galaxy s10 off amazon

i plan to purchase unlocked galaxy s10 off amazon. is unlocked phone bought on amazon the same a far as connectivity coverage as a new phone bought in verizon store ? someone told I might experience worse performance because I have unlocked phone rather than "verizon" phone. also some devices will not work on verizon network, you can check it reading IMEI #. how will I know the phone I plan to buy will work on verizon network ? 

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