Modder's nightmare: T-Mobile Galaxy S7 and S7 edge units come with a locked bootloader
Of course, the mod-savvy folk over at XDA Developers have already started tinkering with their new toys. And while some progress has been made with rooting and installing a custom recovery on the international, Exynos-loaded variants of the Galaxy S7 and S7 edge, the community has discovered that the T-Mobile issued units of the Sammy flagships have their bootloaders locked.
Disgruntled users have taken to Twitter to ask T-Mo CEO John Legere about this and his response was that this is Samsung's choice. According to Mr. Legere, T-Mobile engineers are asking Sammy for a solution, which the manufacturer would be happy with, but there are currently no results.
Upon browsing through the XDA forums, it seems that no Snapdragon 820 has been rooted yet, so we can't know if all US-bound models come with a locked bootloader at this time.
@MarkHibbard1 I'm aware some are upset. It's under Samsung’s control, but my engineers are asking them for a solution that they can support.— John Legere (@JohnLegere) March 13, 2016
source: XDA Developers via TmoNews