Unlock samsung galaxy core from france



    I bought some time ago (2 years ago) a samsung galaxy core in one of your stores, and since them changed phones (bought a galaxy s7 in the same store later on) but my s7 is not working anymore so I took out this galaxy core out of my drawer. Thing is, it's locked. When I try to unlock via app it says it's not eligible. Why ?

    I am now living in France so cannot come to a store. Thanks for your help

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