Cellular phones from Europe and USA will often work in the country with roaming charges depending of your country.
Another option is the Pre-Paid SIMS service with Internet. This can be purchased at Juan Santamaría International Airport and if you want to recharged your SIM, in several locations over the country, like minisupermarkets or drugstores, you can do it without any inconvenience.
If you will used the Pre Paid Sims you shoud have a quad band unlocked cell phone. At the airport only Kölbi offers the service but you can also prepaid SIMS from MoviStar and Claro. Both of them have better coverage than Kölbi. .