LG Viewty Help

Hi, I am seriously considering buying the LG Viewty but I have a
question I hope someone can help me with. Sorry if the question is
stupily simple lol

I have seen the Viewty refered to as simply "LG Viewty" and "LG KU990
Viewty". What is the difference as I can't seem to find any difference
at all? I have also seen it very cheap - £120 yet very expensive - £400
(both PAYG), has this got anything to do with the difference of Viewty
and KU990 Viewty (if there is any difference)? Or is it just stores
conning the public by charging rediculously high prices?

Many thanks




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jbrown79