Android Question

i bought an unlocked lg g2 which when i got it is the intl version.
can i use this in the us?
i want to use straight talk, att carrier.
It probably won't always work on 4G (according to the specs, it's missing the 700MHz and 1700MHz bands, which AT&T uses, but it has the 2100MHz band they use), but it'll work for everything else.
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