Doesn't Work Internationally

I purchased this phone to use with my Verizon plan. Since purchasing, I've traveled out of the US to Canada and Mexico and the phone has not worked internationally either time. Verizon support finally said that this phone does not have the same features as a Verizon model phone, so global data roaming will not work. I was under the impression that this phone would work fully with any carrier as it is an unlocked device.

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