The Group's operating income and expenses from continuing operations analysed by nature of expense is as follows:
| 2008 | 2007(i) | 2006(i) | |
| US$ '000 | US$ '000 | US$ '000 | |
| Revenues | 3,412,380 | 2,623,854 | 1,570,086 |
| Cost of rendering telecommunication services | (831,925) | (686,260) | (431,211) |
| Depreciation and amortization (notes 9,15 and 16) | (515,908) | (351,500) | (227,236) |
| Dealer commissions | (303,435) | (214,202) | (119,875) |
| Employee related costs (note 11) | (206,455) | (167,762) | (95,944) |
| Phone subsidies | (143,881) | (112,700) | (56,695) |
| Advertising and promotion | (143,634) | (111,801) | (45,962) |
| Utilities | (74,157) | (44,647) | (24,410) |
| Operating lease expense (note 28) | (66,350) | (47,339) | (23,156) |
| Network maintenance | (58,814) | (46,794) | (24,347) |
| External services | (53,383) | (51,497) | (31,575) |
| Reduction of goodwill (notes 9 and 15) | – | (23,358) | – |
| Loss on disposal of assets (note 9) | (8,632) | (2,064) | (1,503) |
| Impairment of assets (notes 9 and 16) | (752) | (1,673) | (358) |
| Other operating income | – | – | 4,036 |
| Gain from sale of subsidiaries and joint ventures, net | – | – | 8,099 |
| Other expenses | (137,771) | (90,554) | (51,991) |
| Operating profit (loss) | 867,283 | 671,703 | 447,958 |