I think android requires a great deal more RAM than previous Samsung mobile phones. Maybe the person who spec'd this didn't quite understand android?
Or maybe the parts were not available in the design stage. The largest mobile LPDDR part Micron has in production is 2Gb (256MB). I'm not sure if the chip they use is just a single chip, a POP chip, an MCP chip, or an MCP POP chip, but going with those combinations can reduce availability even further.
A quick search of samsungsemi.com clears up the problem. They are not even sampling 2Gb mobile DDR parts. Micron is currently sampling 4Gb parts. I'm guessing that Samsung electronics did not have the options of going with Micron, and thus we are stuck with a 1Gb part.
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