Samsung kept it hush-hush, but the new Galaxy Note7 is the first commercial device with 4x4 LTE MIMO thanks to Qualcomm's X12 modem. It's currently disabled, perhaps waiting for testing to be complete before being enabled via an update. Also, 256 QAM may be enabled by such an update, pushing up to 33% more bits over the same number of megahertz. Combined, these will give the Note7 better reception and faster connection speed. There are a few "ifs" to go along with that. Obviously, this is for the Snapdragon 820 model. The Exynos 8890 may only support 2x2 MIMO. Then again there's...
Source: http://www.gsmarena.com/samsung_galaxy_note7_may_be_the_first_lte_phone_with_4x4_mimo-news-19871.php
