As the 3G network is rolled out can the 3G cell sites be used to
improve coverage of 2G also ?

I have noticed telegraph pole type cell sites appearing that are for
3G according to sitefinder.gov. uk website . Poor 2G coverage exists
there also. Will there be any improvement in the 2G coverage, or are
the sites soley for 3G ?

I ask because my current phone Samsung D480 only picks up 2G signal