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Disclosure - CASH AND CASH EQUIVALENTS AND INVESTMENTS - Cash and cash equivalents and Investments (Details) link:presentationLink link:calculationLink link:definitionLink 40202 - Disclosure - CASH AND CASH EQUIVALENTS AND INVESTMENTS - Financial position information (Details) link:presentationLink link:calculationLink link:definitionLink 40204 - Disclosure - CASH AND CASH EQUIVALENTS AND INVESTMENTS - Earnings (loss) information (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - BORROWINGS (Details) link:presentationLink link:calculationLink link:definitionLink 40803 - Disclosure - INCOME TAX AND DEFERRED INCOME TAX ASSETS/LIABILITIES - Reconciliation of Income tax expense (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - ADDITIONAL INFORMATION OF FINANCIAL ASSETS AND LIABILITIES - Financial assets and liabilities denominated in foreign currencies (Details) link:presentationLink link:calculationLink link:definitionLink 41002 - Disclosure - ADDITIONAL INFORMATION OF FINANCIAL ASSETS AND LIABILITIES - Offsetting of financial assets and financial liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - REVENUES (Details) link:presentationLink link:calculationLink link:definitionLink 41303 - Disclosure - OPERATING EXPENSES - Expenses disclosed per function (Details) link:presentationLink link:calculationLink link:definitionLink 41401 - Disclosure - FINANCIAL RESULTS, NET (Details) link:presentationLink link:calculationLink link:definitionLink 41602 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 - Assets and liabilities on the acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY link:presentationLink link:calculationLink link:definitionLink 00505 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 30703 - Disclosure - BORROWINGS (Tables) link:presentationLink link:calculationLink link:definitionLink 31603 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 (Tables) link:presentationLink link:calculationLink link:definitionLink 40102 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES - Subsidiaries (Details) link:presentationLink link:calculationLink link:definitionLink 40104 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES - Segment financial information as per geographical area (Details) link:presentationLink link:calculationLink link:definitionLink 40105 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES - Consumer Price Index (Details) link:presentationLink link:calculationLink link:definitionLink 40203 - Disclosure - CASH AND CASH EQUIVALENTS AND INVESTMENTS - Investments in associates and joint ventures (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - GOODWILL (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - PP&E (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - PP&E - Movements in PP&E (without allowance for obsolescence and impairment of materials and accumulated impairment of others PP&E) (Details) link:presentationLink link:calculationLink link:definitionLink 40403 - Disclosure - PP&E - Movements for materials and others PP&E (Details) link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - INTANGIBLE ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 40502 - Disclosure - INTANGIBLE ASSETS - Movements in Intangible assets (without considering the impairment allowance) (Details) link:presentationLink link:calculationLink link:definitionLink 40503 - Disclosure - INTANGIBLE ASSETS - Provision for impairment of intangible assets (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - RIGHT OF USE ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 40703 - Disclosure - BORROWINGS - Notes (Details) link:presentationLink link:calculationLink link:definitionLink 40704 - Disclosure - BORROWINGS - Loans related to the acquisition of TMA (Details) link:presentationLink link:calculationLink link:definitionLink 40705 - Disclosure - BORROWINGS - Other bank loans (Details) link:presentationLink link:calculationLink link:definitionLink 40802 - Disclosure - INCOME TAX AND DEFERRED INCOME TAX ASSETS/LIABILITIES - Movements in deferred income tax assets/(liabilities), net (Details) link:presentationLink link:calculationLink link:definitionLink 40902 - Disclosure - PROVISIONS AND ALLOWANCES - Evolution of provisions (Details) link:presentationLink link:calculationLink link:definitionLink 40903 - Disclosure - PROVISIONS AND ALLOWANCES - Legal claims and contingent liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 41003 - Disclosure - ADDITIONAL INFORMATION OF FINANCIAL ASSETS AND LIABILITIES - Financial assets and liabilities recognized at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 41004 - Disclosure - ADDITIONAL INFORMATION OF FINANCIAL ASSETS AND LIABILITIES - Fair value of borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - PURCHASE COMMITMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 41501 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Balances with related parties (Details) link:presentationLink link:calculationLink link:definitionLink 41502 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES - Transactions with Related parties (Details) link:presentationLink link:calculationLink link:definitionLink 41601 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 (Details) link:presentationLink link:calculationLink link:definitionLink 41603 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 41604 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 - Impact on operations for the period (Details) link:presentationLink link:calculationLink link:definitionLink 41606 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 - Provisions of the telecom ordinary and extraordinary shareholders' meeting (Details) link:presentationLink link:calculationLink link:definitionLink 41701 - Disclosure - SUBSEQUENT EVENTS TO SEPTEMBER 30, 2025 (Details) link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - CASH AND CASH EQUIVALENTS AND INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - GOODWILL link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - PP&E link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - RIGHT OF USE ASSETS link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - BORROWINGS link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - INCOME TAX AND DEFERRED INCOME TAX ASSETS/LIABILITIES link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - PROVISIONS AND ALLOWANCES link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - ADDITIONAL INFORMATION OF FINANCIAL ASSETS AND LIABILITIES link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - PURCHASE COMMITMENTS link:presentationLink link:calculationLink link:definitionLink 11201 - Disclosure - REVENUES link:presentationLink link:calculationLink link:definitionLink 11301 - Disclosure - OPERATING EXPENSES link:presentationLink link:calculationLink link:definitionLink 11401 - Disclosure - FINANCIAL RESULTS, NET link:presentationLink link:calculationLink link:definitionLink 11501 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES link:presentationLink link:calculationLink link:definitionLink 11601 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 link:presentationLink link:calculationLink link:definitionLink 11701 - Disclosure - SUBSEQUENT EVENTS TO SEPTEMBER 30, 2025 link:presentationLink link:calculationLink link:definitionLink 20102 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 30103 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 30203 - Disclosure - CASH AND CASH EQUIVALENTS AND INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - GOODWILL (Tables) link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - PP&E (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 30603 - Disclosure - RIGHT OF USE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 30803 - Disclosure - INCOME TAX AND DEFERRED INCOME TAX ASSETS/LIABILITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 30903 - Disclosure - PROVISIONS AND ALLOWANCES (Tables) link:presentationLink link:calculationLink link:definitionLink 31003 - Disclosure - ADDITIONAL INFORMATION OF FINANCIAL ASSETS AND LIABILITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 31203 - Disclosure - REVENUES (Tables) link:presentationLink link:calculationLink link:definitionLink 31303 - Disclosure - OPERATING EXPENSES (Tables) link:presentationLink link:calculationLink link:definitionLink 31403 - Disclosure - FINANCIAL RESULTS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 31503 - Disclosure - BALANCES AND TRANSACTIONS WITH RELATED PARTIES (Tables) link:presentationLink link:calculationLink link:definitionLink 40101 - Disclosure - BASIS OF PREPARATION OF THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 40702 - Disclosure - BORROWINGS - Movements in Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 40801 - Disclosure - INCOME TAX AND DEFERRED INCOME TAX ASSETS/LIABILITIES - Movements in income tax liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - PROVISIONS AND ALLOWANCES - Evolution of the allowances deducted (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - OPERATING EXPENSES (Details) link:presentationLink link:calculationLink link:definitionLink 41302 - Disclosure - OPERATING EXPENSES - Components of operating expenses (Details) link:presentationLink link:calculationLink link:definitionLink 41402 - Disclosure - FINANCIAL RESULTS, NET - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 41605 - Disclosure - RECENT DEVELOPMENTS CORRESPONDING TO THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 2025 - Regulatory impact of the acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink