The graph below shows consumers’ average annual expenditure on cell phone, national and international fixed-line and services in America between 2001 and 2010.

The line graph illustrates the average yearly spending on three phone services: cell phone services, national fixed-line services, and international fixed-line services from 2001 to 2010. Overall, the three types of services exhibited different trends. Cell phone services were the only category to show an upward trend. In contrast, national fixed-line services experienced a gradual […]