XDA Portal & Forums - You can buy the carrier unlocked SD820 S7 & Edge in the USA http://www.xda-developers.com/carrier-unlocked-sd820-galaxy-s7-edge-available-in-usa-bootloader-likely-still-unpenetrable/ | Facebook
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Samsung Galaxy S7 - Wikipedia
Galaxy S7 Bootloader Explained: You Might Not Get AOSP After All