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Cell Phone Mania

Consider this table of data relating to cell phone use:

ItemDec. 1988Dec. 2004
Average Monthly Cell Phone Bill $98.02$50.64
Number of Cell Sites 3,209175,725
Estimated Number of Subscribers 2,069,441182,140,362

Assuming growth in each row is linear, what are the three expected values for years 2010 and 2025?

  • Average Monthly Cell Phone Bill?
  • Number of Cell Sites?
  • Estimated Number of Subscribers?

Assuming growth in each row is exponential, what are the three expected values for years 2010 and 2025?

  • Average Monthly Cell Phone Bill?
  • Number of Cell Sites?
  • Estimated Number of Subscribers?
    • Source: CTIA, The Wireless Association Yearend 2004 Survey