AT&T and Verizon are usually the only carriers that bother locking bootloaders with no authorized unlock option. Most international/unlocked phones have some wa

AT&T and Verizon are usually the only carriers that bother locking bootloaders with no authorized unlock option. Most international/unlocked phones have some way of unlocking the bootloader. Samsung has recently started locking things down more with Knox I suppose, but I think the bootloader is still relatively open (my T-Mobile Note 3 and international Galaxy Note 10.1 2014 happily installed a custom recovery without any fiddling).