In 2005, Sprint bought Nextel in a $36 billion deal that was meant to be a "merger of equals." But combining the companies was tough: Nextel's network ran on a different technology than Sprint's, creating a wireless infrastructure nightmare. Sprint(S) racked up expenses over the years as Nextel's "push-to-talk" setup fell out of favor, and those subscribers fled in droves. Finally, Sprint announced in May 2013 that the Nextel network would be shut down one month later. It died Sunday night.