The graph shows that the average cost that American customers spent on cell phone and residential phone services annually over ten years period.
In 2001, expenditures for cell phone services started by solely $200, then the amount of annual expenditure on residential phone services was around $700. For the following five years, expenditure on residential phone services gradually went down below $600, whereas expenditure on cell phone services increased to just over $500.
In 2006 cell phones overtook residential phones, and the services became equal in popularity with customers annual expenditure of around $550. In 2010, cell phone went up around $750. Moreover expending on residential phone services dropped in 2007 and went on steadily fell for the rest of the period.
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