To call a phone number in Costa Rica from the United States, you will need to dial the following sequence:

Dial the exit code for the United States, which is 011. This code is used to tell the phone system that you are making an international call.

Dial the country code for Costa Rica, which is 506. Every country has its own unique country code, and this code is used to tell the phone system which country you are trying to call.

Dial the area code for the city or region you are trying to reach. Costa Rica has many different area codes, so you will need to find the one that corresponds to the location you are trying to call.

Dial the local phone number. The local phone number in Costa Rica is made up of seven digits.

Here is an example of what the full phone number might look like:

011 506 2223 4567

In this example, 011 is the exit code for the United States, 506 is the country code for Costa Rica, 2223 is the area code for the city or region, and 4567 is the local phone number.

I hope this helps!