I forgot. Unlocked means it will work on other carriers whether in US or other. International means it will work on all four bands. So Unlocked International is the most flexible. Double sim card phones means you can have two completely different phone numbers on one phone that operate independently as if you are holding two phones. You can even put one on hold and answer the other number, different call waiting, etc. Work and personal, etc. You have to pay for two lines from the carrier of course.
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