I used galaxy core for 2 years. My big brother brought for me from Greece. It was very fast smart phone. But when I istall faceboon, viber, whats app, messenger then it became very slow. Slow app opening. Slow every thing. But I fan of its slimness in old smart phones. It has a great strong touch because often my cell drop from my hand but it still wotking fine.
But I am.not satisfied with peformance of proccesor and ram. I am.not use duos model od Galaxy Core. I hear that it is betyer than Galaxy Core Old version.