Does Sony Xperia U support USB on-the-go?
And is USB on-the-go s/w dependent or h/w dependent?
Answering the second part of you question,USB OTG on phones or on any other device is hardware dependent as this feature requires the hardware designers to embed this on to IC of the motherboard.
A driver is always required whether native or third party external one with extended features so as to provide communication facility between OS and the hardware.
You can have more information by reading the " Device roles " section of Wikipedia article.
Of course, it supports!
Ya it's got it. My friends S3 has it and it comes in handy to view data on the go.
the xperia nxt series natively supports the usb on the go features
Sony xperia U