Top 38/100 Telecommunications company of the World is Brazilian 'Oi (formerly Telemar)' = $8.2Billion revenue.
Also Vivo,TIM is Brazilian
Telcel is Mexico
Claro is Colombia,Costa Rica & Chile
Movistar,Entel is also Chile & Costa Rica
Orange is also in South America
More to name :
Tigo
Digicel
AT&T are there
Virgin
Nextel
Could be any of those.