Post is slow and expensive, especially overseas. They will not send anything airmail that weighs more than 20 grams. You will have to send it registered, which is costly. Parcels take a minimum of 3 months or so. Sometimes, you will have to pay when you pick up a parcel, even though postage was paid in the country of origin.
Telephone is cheap locally but quite expensive long distance.
It is relatively easy to get a good connection though. English newspapers are available only in the centers of the large cities and only some of the time. English TV is limited and the news you do get is very Europe-centered, so there is very little about North American news. If you can, get in touch with somebody who has worked or is working at the school or company you are interested in and ask them some questions. Then take everything with a grain if salt.