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So I'm back to clarify.
RAM = Ram of course.
System memory = The space where Android is kept and other stuff which the user can't modify.
Phone memory = Where downloaded app's are stored by default.
Internal storage = Where all your media is stored.
It's completely different things:
Phone memory - RAM
Internal storage - free space in your phone
So you mean that the Xperia U has 2 GB of RAM?
Have you read the white paper?
Then why u ask dumb questions?
ccording to white paper..
RAM 512 MB
System memory 2 GB
Phone memory 2 GB
Internal storage 4 GB
since it does not have any sd card slot.. internal storage = system + phone...
i think so.. not sure.
guys dont fight
it was a god question but still the author you shouldn't have laughed
bobeobi was just trying to help..
Alright, sorry for laughing. 
I don't get it, why would the system and phone memory be equal to the internal storage? They store different data, system memory is the ROM (I think).
like i said i'm not sure
wait for any other user to reply....
I'm checking this with one of my colleagues.
I'll be back! 
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