Hi
For last two months I am facing some problem regarding ranking and supplemental results.

The domain of the sites are “add it now� (.co.uk)
“3 contract mobile phones� (.co.uk)
* remove the spaces

The first site used to rank very good on google but now it is now where in google. The latest PR update has given 3 – 4 PR for most of the static pages but there no change in ranking.

The second site is ranking for general words such as “ mobiles, phones, mobile phones� but it is not ranking for handset specific keywords.
These two sites are part of white label business.

Can anyone put some light on the above mentioned problem.

better to use anchor text while posting, then you will get ranking for appropriate keywords!

keyword ranking and page ranking is different method. PR don't effect or help keyword ranking or SERP traffics.