| 2.11 | Property and Equipment |
Property and equipment are stated at its cost less accumulated depreciation and accumulated impairment losses. Historical cost includes expenditures that is directly attributable to the acquisition of the items.
Depreciation of all property, plant, and equipment, except for land is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives, as follows:
| Estimated Useful Life | ||
|
Buildings |
5 – 40 years | |
|
Structures |
5 – 40 years | |
|
Machinery and equipment (Telecommunications equipment and others) Others |
2 – 40 years | |
|
Vehicles |
4 – 6 years | |
|
Tools |
4 – 6 years | |
|
Office equipment |
2 – 6 years |
The depreciation method, residual values and useful lives of property and equipment are reviewed at the end of each reporting period and, if appropriate, accounted for as changes in accounting estimates.