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Basis of preparation and summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Estimated Useful Lives for the Current and Comparative | The estimated useful lives are as follows:
Buildings |  | 21 – 25 years
Mobile network infrastructure |  | 4 – 20 years
Fixed network infrastructure |  | 3 – 25 years
Call center equipment |  | 4 – 8 years
Equipment, fixtures and fittings |  | 2 – 10 years
Motor vehicles |  | 4 – 6 years
Central betting terminals |  | 5 – 10 years
Leasehold improvements |  | 3 – 5 years
Disclosure of Useful Lives for the Intangible Assets | The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:
Transmission line software |  | 5 – 10 years
Central betting system operating right |  | 7 – 10 years
Customer base |  | 2 – 15 years
Brand name |  | 9 – 10 years
Indefeasible right of use |  | 15 years
Disclosure of Estimated Useful Lives for Investment Properties | The estimated useful lives are as follows: Investment Property 25 – 45 years
GSM and other telecommunication operating licenses [member] |
Disclosure of Useful Lives for the Intangible Assets | The useful lives for telecommunication licenses are as follows:
Telecommunications licenses |  | 3 – 25 years
Computer software [member] |
Disclosure of Useful Lives for the Intangible Assets | The useful lives for computer software are as follows:
Computer software |  | 3 – 8 years

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