You have a couple options:
1. You can buy a pre-paid phone card (at airport or anywhere in town). For ¢3,000 ($6), you will have 18 minutes to the US. You can call from your hotel room or a pay phone.
(When staying at SL in my early trips, I would always see a charge of about $0.50 on my bill for each call that I made using the calling card. I could never get a clear explanation why I was charged when using a calling card, I didn't really fight it.)This is what it looks like, the picture/color differs but it must say
199 on it:
http://home.roadrunner.com/~orange/prep ... one199.jpg2. You can rent a cell phone (with SIM) for $10/day. If you are staying for a week, that'll cost you $70. Local calls are free, but calls to the US cost $1.05/minute. It can quickly add up. Here's the company to use:
http://www.cellulartelephonerentals.com/3. And the best for last.... this is the option where you bring your own UNLOCKED GSM cell phone and buy a prepaid SIM at the airport for ¢2500-10000 ($5-$20). You will have local calls and texts, as well as the ability to call the US. With the ¢10,000 SIM, you'd have local calls and texts, with about 60 minutes to the US.
If you run out of time, you can recharge it for any amount. You must bring an UNLOCKED, GSM cell phone that is compatible with the 1800Mhz band (some dual band phones, all tri- and quad-band phones will work).
You can buy a new unlocked phone on Ebay or Amazon for pretty cheap.
http://www.amazon.com/Motorola-SLVR-L6i ... 524&sr=8-7http://www.amazon.com/Motorola-V3-Unloc ... 595&sr=8-8http://www.amazon.com/Motorola-V188-Qua ... 95&sr=8-12http://www.amazon.com/Motorola-V190-Unl ... 39&sr=1-18