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OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES | 12 Months Ended
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Dec. 31, 2018
OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES |
OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES | 28. OPERATION, MAINTENANCE AND TELECOMMUNICATION SERVICE EXPENSES The breakdown of operation, maintenance and telecommunication service expenses is as follows:
|  | 2016 |  | 2017 |  | 2018
Operation and maintenance |  | 17,047 |  | 19,929 |  | 25,215
Radio frequency usage charges (Note 35c.i) |  | 3,687 |  | 4,276 |  | 5,473
Leased lines and CPE |  | 4,141 |  | 5,255 |  | 5,125
Concession fees and USO charges |  | 2,217 |  | 2,249 |  | 2,297
Cost of sales of handset (Note 8) |  | 1,481 |  | 1,544 |  | 1,860
Electricity, gas and water |  | 960 |  | 1,037 |  | 1,051
Cost of SIM cards and vouchers (Note 8) |  | 624 |  | 914 |  | 866
Tower leases |  | 322 |  | 472 |  | 480
Vehicles rental and supporting facilities |  | 367 |  | 301 |  | 413
Insurance |  | 256 |  | 294 |  | 193
Others |  | 161 |  | 332 |  | 920
Total |  | 31,263 |  | 36,603 |  | 43,893
Refer to Note 33 for details of related party transactions.

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