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What did my comment have to do about that?
I was making a joke about samsung...
I didn't even say anything about an iPhone, let alone a 5/5s/6/6s???
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Actually, they could do something like fusion drive - in that a filesystem can span multiple volumes without the user noticing.
They would NEVER do that, though, because Apple relies on the margins from the higher-end iPhones to keep the profits as high as they do. IE - a 16GB iphone might (I'm making this number up) cost 450 bucks to build, and they sell it for 650, but a 64gb iPhone only costs 500 to built, at most - and they sell it for 850. Much higher profit margins, amirite?