Note 8: Property, Plant and Equipment
The net book value of property, plant and equipment as of December 31, 2007 and 2006, was as follows:
| December 31, | |||
| 2007 | 2006 | ||
| Network, base station equipment (including leased network and base station equipment of $1,533 and $7,676, respectively) and related leasehold improvements |
$6,374,063 | $4,517,536 | |
| Office equipment, computers and other | 641,095 | 447,640 | |
| Buildings and related leasehold improvements | 352,313 | 242,175 | |
| Vehicles (including leased vehicles of $13,269 and $7,561, respectively) | 40,973 | 31,949 | |
| Property, plant and equipment, at cost | 7,408,444 | 5,239,300 | |
| Accumulated depreciation (including accumulated depreciation on leased equipment of $5,625 and $4,321) |
(3,079,376) | (1,948,368) | |
| Equipment for installation | 748,447 | 582,827 | |
| Construction in progress | 1,529,800 | 1,423,910 | |
| Property, plant and equipment, net | $6,607,315 | $5,297,669 | |
Depreciation expenses during the years ended December 31, 2007, 2006 and 2005, amounted to $999.0 million, $689.7 million and $510.5 million, respectively, including depreciation expenses for leased property, plant and equipment in the amount of $2.8 million, $2.3 million and $4.0 million, respectively.