text: Components of an item of property, plant and equipment may have 
  different useful lives. We make significant estimates when determining 
  depreciation methods, depreciation rates and asset useful lives, which 
  requires taking into account industry trends and company-specific 
  factors. We review these decisions at least once each year or when 
  circumstances change. We will change our depreciation methods, 
  depreciation rates or asset useful 
  lives if they are different from our 
  previous estimates. We recognize the effect of these changes in net 
  income prospectively. 
  
  We amortize intangible assets with finite useful lives on a straight-line 
  basis over their estimated useful lives as noted in the table below. We 
  review their useful lives, residual values and the amortization methods 
  at least once a year. 
  
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          <table frame="hsides" rules="groups" width="100%%">
              [html]<thead><tr><td>Brand names</td><td>7 to 20 years</td></tr></thead><tbody><tr><td>Customer relationships</td><td>3 to 10 years</td></tr><tr><td>Roaming agreements</td><td>12 years</td></tr><tr><td>Marketing agreements</td><td>3 years</td></tr></tbody>
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