The line graph below shows US consumers' average annual expenditures on cell phone and residential phone services between 2001 and 2010.

The graph compares how much money was yearly spent on two kinds of

phone

services categorised into

cell

phones

and residential

phones

by Americans over a 9-year period.

It is clear that

the expenditure on residential

phones

fell over the period shown,

while

cell

phones

became by far more popular among American

phone

service users. In 2001, almost no one in the USA tended to use

cell

phones

as a means of calling, compared to the nearly 700

dollars

they spent on residential

phone

services. Over the next 6 years, the average amount of money spent on

the

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show examples

cell

phones

increased dramatically

while

this

amount for residential

phones

dropped. In early 2006, the same sum of money was expended for the reason of calling through both

cell

and residential

phones

being just over 500

dollars

.

This

amount for the

cell

phone

continued to increase reaching around 750

dollars

by 2010

whereas

residential users seemed to have a fall of nearly 150

dollars

to hardly 400$ in that year.