First of all, here is a link about the data. It is in Spanish.
Also if you want to find out more about Kolbi prepaid, check the subjects under the "prepago" drop down menu.
Jim, yes if you arrive in the baggage area before your bags, you can head over to the counter while you are waiting. If there is more than one in your party, one can watch for the bags while the other gets the SIM.
@mati - providing a phone is unlocked and supports the right frequency of GSM (I think iphones are quad band so OK) once you take out the home SIM and put in the new SIM, you now have Costa Rica service. You get a CR phone numer with the SIM. it is an 8 digit number. So when you use your phone you are not accessing your home carrier at all. You are not roaming. You pay local Costa Rican rates for calls - which are about 34 colones a minute for local calls and about 30 US cents a minute for long distance to Canada or US. Incoming calls are free to the person receiving them.
It is a pay as you go service - so once you use up your time you just recharge.
For people from home to call you they have to dial 011 506 xxxx xxxx. The amount they pay depends on their home phone plan.
Data is included as part of the service so you can get internet anywhere you can get a phone signal at a very low rate.
Of course if you have a Telus (or whatever) contract you will still be paying Telus the monthly contract rate while you are away - but not racking up extra charges.
Since I travel to CR alot, I keep my SIM active. So sometimes in the middle of my flight, I take my Rogers SIM out and replace it with my Kolbi SIM.
But as I said, for data - I very often just use wi fi on the phone. Every phone is different about the specifics of changing settings.
By the way the other carriers - Movistar and Claro have Costa Rican web sites - so if you want you can also check them out. I don't want to sound like I am specifically plugging ICE/Kolbi. But that is the company I am familiar with. The others are newer to CR and stil buiding their infrastructure etc.