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I think if Samsung or anybody else sold a mobile with, say, an exploding battery then they would be obliged to recall the product and supply replacements. But this doesn't mean that if they improve their product they are obliged to provide replacements for free. Car manufacturers only recall their products when there is a safety issue. If they uprate the specification - new styling, better engine, satnav included etc - then to get them if you have to buy a new car.