Then, cell phone expenses rose to approximately $750 .............. ...............,
in 2010
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15
....... ...................... cell phones overtook landline phones, and the services became equal in popularity with customers' annual expenditure of about $550.
In 2006
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15
whereas expenditure on cell phone services rose to just over ...........................
$500
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20
Over the following .................. ......................, expenditure on landline phone services gradually dropped below $600,
five years
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20
Meanwhile, spending on residential phone services experienced a steep fall in 2007 and went on to................ ....................... for the rest of the period.