This depends on your individual plan with your cell phone carrier. Some companies offer reasonable roaming plans. Others do not offer the service or do so at exorbitant rates.
If you have an unlocked phone with removable SIM card, you can purchase a prepaid SIM card at the airport or any ICE, Movistar or Claro office. These cards cost around $20 and are good for 250 minutes worth of calls within Costa Rica or approximately 65 minutes worth of international calls.
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