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Other assets, net | 12 Months Ended
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Dec. 31, 2018
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Other assets, net | 9. Other assets, net An analysis of other assets at December 31, 2017 and 2018 is as follows:
|  | 2017 |  |  | 2018 |
Current portion: |  |  |  |  |  |  |  |
Advances to suppliers (different from PP&E and inventories) |  |  | Ps. 9,536,654 |  |  |  | Ps. 12,931,247 |
Prepaid insurance |  |  | 683,091 |  |  |  | 949,590 |
Costs of mobile equipment and computers associated with deferred revenues |  |  | 6,182,010 |  |  |  | 599,628 |
Other |  |  | 950,991 |  |  |  | 815,728 |
|  |  | Ps. 17,352,746 |  |  |  | Ps.15,296,193 |
Non-current portion: |  |  |  |  |  |  |  |
Recoverable taxes |  |  | Ps. 12,249,372 |  |  |  | Ps. 11,514,455 |
Prepayments for the use of fiber optics |  |  | 4,361,668 |  |  |  | 3,985,216 |
Prepaid expenses and judicial deposits (1) |  |  | 25,926,436 |  |  |  | 26,961,930 |
Total |  |  | Ps. 42,537,476 |  |  |  | Ps. 42,461,601 |
For the years ended December 31, 2016, 2017 and 2018, amortization expense for other assets was Ps. 1,340,609, Ps. 620,680 and Ps. 798,243, respectively.
(1) | Judicial deposits represent cash and cash equivalents pledged in order to fulfill the collateral requirements for tax contingencies mainly in Brazil. At December 31, 2017 and 2018, the amount for these deposits is Ps. 20,288,382 and Ps. 18,172,342, respectively. Based on its evaluation of the underlying contingencies, the Company believes that such amounts are recoverable.

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- Definition The disclosure of other assets. [Refer: Other assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
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