The hardest to tell among all the fakes is the 98% clone especially if you base it on the appearance. Every spec is copied down to the menu and to the icons. But one give away to ALL the fakes even the 98% clone is in the menu. There is no way a fake/clone samsung could have access to the samsung app store so check it carefully. In the original samsung s3 or s3 mini the app store is supposed to say "Samsung Apps" while in all the fake ones it only says "Apps".