LaTeX's standard styles use two page styles, one on normal
pages and one on 'opening' pages with \maketitle or \chapter,
etc. Unfortunately there is only easy access to changing one of
these two so if you want something other than 'plain' on the
opening pages you must use \thispagestyle on each such page.
The fancyhdr package does provide a more flexible interface,
but if you just want an empty page style on all pages then this
package will do the job.