Long before Apple became popular with their Mobile devices Samsung concentrated on copying the likes of Nokia, Blackberry and in general electronics the Japanese brands, like Canon, Sony, etc, offering cheaper, but mostly crappier alternatives to the higher quality originals.
Then a few years ago came into the spotlight and Samsung realized where the money is: mobile personal devices and they copied Apple in the beginning. I am sorry, but if someone thinks otherwise, they live in complete denial or just post counter arguments because of some dislike of Apple. I still had to laugh when I saw a Samsung Webpage of a mobile music player, which looked like a Apple Web rip off and completely out of place, because the rest of their company websites had a complete different feel.
Their tactics worked. Copy Apple initially and then slowly gain momentum and become successful and popular. Ironically I would say, that Apple provided Samsung with some free marketing, too. By putting Samsung into the spotlight, users not so familiar with present mobile market would probably get the impression, that if one doesn't chose Apple, then Samsung is the way to go in to Android World, because they copied "the best" products

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However it seems Samsung is still trying to find its own mobile phone identity with packing every feature (mostly useless) into their blandly designed mobile products.
But looking at the profits of Samsung which haven't been super stellar lately, I would't concentrate on fighting Samsung anymore. Their momentum is dwindling. Android users don't have to be so brand loyal. They can move their apps, etc, to another branded phone, if they find a better alternative (I certainly have. My Galaxy Note really disappointed me)
Personally i wished Apple would now move on and concentrate on making their mobile products better. Especially iOS needs some serious overhaul under the hood.