Well this is interesting: http://www.xda-developers.com/galaxy-s7-bootloader-lock-explained-you-might-not-get-aosp-after-all/ Nothing new to use AT&T and Verizon users, but Tmobile has always had an open bootloader on their devices. Now Tmobile and Sprint seem to be locking down their phones as well, starting with the S7/edge. From what I understand the international/Canadian versions still have open bootloaders. Ostensibly this is because Samsung wants to keep Samsung Pay secure, which probably means every single phone of theirs will be bootloader locked. It doesn't mean a root won't be released, but it will have to rely on an exploit. That is much more difficult as evidenced by the lack of any sort of root on the AT&T Note 5. Definitely a sad day as us techies see our options dwindle. I had high hopes of buying a Note 6 on Tmobile and using it on AT&T, but those hopes are dashed now.