Do your best to touch base with the office prior to traveling to the Lodge. There may be last minute details to discuss, especially if it has been raining. If you reach the answering machine, leave a number and a time when you can be reached, or a fax number, or try to call back later. The number is 225-4049. Public phones are relatively easy to find in most of Costa Rica.
Some phones only accept calling cards, but there are always some nearby that take coins.
There is one phone right at the bus station in San Jos , and also one on the same block as the bus station in Lim n. There is also one in the town of Bananito.