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Inventories, net
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Inventories, net
8. Inventories, net
An analysis of inventories at December 31, 2018 and 2019 is as follows:
 
   2018   
2019
 
Mobile phones, accessories, computers, TVs, cards and other materials
  Ps.43,723,492   
Ps.
43,954,616
 
Less: Reserve for obsolete and slow-moving inventories
   (3,418,130)   
 
(2,852,604
) 
  
 
 
   
 
 
 
Total
  Ps.40,305,362   
Ps.
41,102,012
 
  
 
 
   
 
 
 
For the years ended December 31, 2017, 2018 and 2019, the cost of inventories recognized in cost of sales was Ps. 170,154,336, Ps. 180,013,986 and Ps. 174,543,602
,
respectively.