How does TELUS account for purchases of new property, plant, and equipment on its balance sheet? What method(s) does TELUS use to depreciate its property, plant, and equipment? What was TELUS' depreciation expense for property, plant, and equipment in 2011? How much depreciation had been accumulated against property, plant, and equipment on December 31, 2011? Why does TELUS depreciate its property, plant, and equipment (aside from the fact it's required by IFRS)? What does the carrying amount of TELUS' property, plant, and equipment tell you about what it could be sold for? What does the carrying amount tell you about what these assets are "worth" to TELUS?