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Samsung and Other Manufacturers Disable Phones Bought on Gray Markets: A Consumer Nightmare
(nomadscrolls.net)
This is a most excellent place for technology news and articles.
Which countries get unlockable bootloader? I know Samsung devices aren't unlockable in the US.
Pretty much every country besides the US, AFAIK.
Honestly, no idea. I think locking them isn't allowed in Europe, so I've never encountered a locked phone.