UPDATE 2-Mexico's America Movil quarterly net profit slammed by strong peso

(Changes headline, changes paragraph 1, adds company and analyst quotes, details on new subscribers, Chilean impairment charge)

MEXICO CITY, Oct 17 (Reuters) - Mexican telecommunications giant America Movil's net profit plummeted 88.7% in the third quarter, to 2.0 billion pesos ($116.3 million), amid higher financing costs and a stronger peso, it reported on Tuesday.

The Mexican peso strengthened 5% against the dollar in the third quarter, which the company said diluted its foreign earnings.

The company, controlled by the family of Mexican tycoon Carlos Slim, reported revenues 3.3% down from a year earlier, hitting 203.8 billion pesos.

Revenues would have jumped 3.8% if not for the Mexican peso's appreciation against all other currencies, America Movil said in its filing to the Mexican stock exchange.

Earnings before interest, taxes, depreciation and amortization (EBITDA), fell 3.6% to 79.9 billion pesos in nominal terms, compared with the same period a year ago.

Analysts at Mexican brokerage Vector had expected the peso's strength to squeeze company revenues and EBITDA. Without it, they saw both rising 5%.

The peso is forecast to continue strengthening through the year, which could

further hit

corporate profits.

Marissa Garza, analyst at Banorte, said America Movil reported a "mixed result aligned with what was expected in operational terms, but down on a net level due to greater exchange losses and an extraordinary impairment charge."

America Movil said it had a 4.7 billion peso charge associated with the partial impairment of its stake in Claro Chile, a

joint venture

with Liberty Latin America.

The company spent a total of 29.7 billion pesos in financing during the quarter.

It added 3.0 million mobile subscribers, including 2.0 million post-paid customers, driven by the Brazilian market. In the fixed-line segment, the company added 223,000 broadband accesses.

"In several countries - Brazil, Peru, Colombia and Central America - we had among the highest, if not the highest, net broadband additions in the past three years," the company said.

($1= 17.4279 Mexican pesos at the end of September) (Reporting by Valentine Hilaire, Cassandra Garrison and Marion Giraldo; Editing by Leslie Adler)