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Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2017
Significant accounting policies  
Schedule of depreciation and estimated useful lives of property, plant and equipment

 

 

Asset

 

Estimated useful
life (in years)

Buildings received from ENTel

 

35

Buildings acquired subsequent to 11/8/90

 

50

Improvements in third parties buildings

 

2 – 5

Tower and pole

 

10 – 20

Transmission equipment

 

3 – 20

Wireless network access

 

3 – 7

Switching equipment

 

5 – 7

Power equipment

 

7 – 15

External wiring

 

3 – 20

Computer equipment and software

 

3 – 5

Telephony equipment and instruments

 

5

Installations

 

2 – 10

 

Schedule of property, plant and equipment related to financial leases

 

 

 

 

Book value

 

Lease term

 

Depreciation

PP&E – Computer equipment

 
77

 

3 years

 

3 years

Accumulated depreciation

 
(64)

 

 

 

 

 

 

 

 

 

 

 

Net carrying value as of December 31, 2017

 
13

 

 

 

 

 

 

 

 

 

 

 

 

Schedule of assumptions used in determining expense and benefit obligations

 

 

 

 

2017

 

2016

 

2015

Discount rate (1)

 

4.6% - 9.2%

 

4.8% - 6.2%

 

6.5% - 8.5%

Projected increase rate in compensation (2)

 

8.0% - 16.3%

 

8.0% - 22.5%

 

12.0% - 26.8%

 

(1) Represents estimates of real rate of interest rather than nominal rate in $.

(2) In line with an estimated inflationary environment for the next three financial years.