Trabano said:While it's totally possible to use a Tarjeta at any public phone, I wouldn't advise using it at a pay phone. If you buy a $10 card, it will be gone in about 5 minutes because the phone will charge you the pay phone cost, rather than what it printed on the back of the card.
When I need to call the US, I like to use the cards and only pay about 13 cents/minute.
Yes, i totally forgot that. Anyway, you can always borrow a house phone for make the call and neither you or the phone owner will be charged.
iStar said:MoviStar and Claro are the two GSM carriers here.
We have Personal too. Personal has the cheapest phones but the prices are higher than the others. Anyway, you can buy a Personal pre-paid sms card (I think it's called "Personal SMS" or "Tarjeta SMS Personal") and is pretty convenient, but you can only send sms with that, not make calls.