The graph shows average annual expenditures on cell phone and residential phone services between 2001 and 2010. Overall, expenditures increased substantially for cell phone services but declined slightly for residential phone services. Specifically, spending on cell phone services rose from $500 in 2001 to over $1000 in 2010, while residential phone service costs decreased from nearly $500 to slightly below $500 during the same period. The largest increase occurred between 2001 and 2005 for cell phone services, when expenditures more than doubled. In contrast, residential phone costs changed little and remained around $500 for most of the decade.