You can blame the <a href='http://wiki.sidekick.com/page/Sidekick+History' target='_blank'>Black &amp; White T-Mobile Sidekick</a> for the millennial generation's obsession with text messaging. The phone was basically a two-way pager, allowing messages to be sent back and forth. The phone retailed for $249 and appeared in Jay-Z's music video "Excuse Me Miss." Later versions added a color screen and quickly became a favorite among celebrities and teens. 