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For the second quarter in a row, Telefonica is the leader of the Latin Wireless Index.
Telefonica's wireless operations saw a strong first quarter in Latin America.
Spain's telecom giant outperformed Mexico's America Movil in the fourth quarter, but not during the full year.
NII Holdings leads wireless growth in Latin America ahead of America Movil and Telefonica.
Latin Wireless Index gains in the second quarter, with Vivo and Oi leading the way.
Oi, Vivo gain most. Telefonica declines and Iusacell grows the least.
Brazilian wireless carriers Oi and Vivo gain most, while Millicom and Iusacell post the weakest results.
Telefonica and Vivo gain on the Latin Wireless Index, while America Movil and NII lose.
