I'm preparing a paper and I created a title page, an abstract page and an acknowledgments page. Those page must not show page numbers. So I used:
\setcounter{page}{-1}
for the title page
and
\thispagestyle{empty}
\setcounter{page}{-1}
for the other page.
In this way the pages numbers aren't show. But is it right to set the same number page to -1 for all pages where I don't want show number?