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unlock code to use different sim in another country

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I bought a S8 in germany and they said that if I use a sim card there, my phone will work in the whole world. I used a O2 sim card there for the internet more than one moth. But when I arrive here in Brazil (where I live), when i put my brazilian sim card, the phone as for a code to unlock and use the sim card, but I don't know how to solve that. Can someone help me please?

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