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OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES | 12 Months Ended
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Dec. 31, 2017
OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES |
OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES | 26. OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES The breakdown of operation, maintenance and telecommunication service expenses is as follows:
|  | 2015 |  | 2016 |  | 2017
Operation and maintenance |  | 15,129 |  | 17,047 |  | 19,929
Radio frequency usage charges (Note 33c.i) |  | 3,626 |  | 3,687 |  | 4,276
Cost of IT services |  | 882 |  | 1,563 |  | 2,648
Leased lines and CPE |  | 1,913 |  | 2,578 |  | 2,607
Concession fees and USO charges |  | 2,230 |  | 2,217 |  | 2,249
Cost of sales of handset (Note 7) |  | 1,493 |  | 1,481 |  | 1,544
Electricity, gas and water |  | 1,014 |  | 960 |  | 1,037
Cost of SIM cards and vouchers (Note 7) |  | 444 |  | 624 |  | 914
Tower leases |  | 646 |  | 322 |  | 472
Vehicles rental and supporting facilities |  | 296 |  | 367 |  | 301
Insurance |  | 312 |  | 256 |  | 294
Others |  | 131 |  | 161 |  | 332
Total |  | 28,116 |  | 31,263 |  | 36,603
Refer to Note 31 for details of related party transactions.

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