It's not a bug as there are stickers n the box for both the Euro and US variants that state this.
One member of XDA rather rudely says that actually even if you buy what you think is an 'unlocked' device, what you are actually buying is a 'region unlocked' device that is not actually unlocked period. In the UK, generally speaking, it is more expensive to buy an unlocked phone than one locked to a carrier, so this is misleading on behalf of Samsung.
If I buy a region unlocked phone, I will still need to unlock it further to use a sim from the USA, although there are no guarantees that this will work.
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