Outbound
Outbound international calls use a 00 trunk prefix, followed by the carrier selection code (same as in domestic long-distance calls) and the international telephone number. So, to call the international telephone number +cc-aa-nnnn-nnnn (where cc is the country code and aa the area code), one would dial 00-xx-cc-aa-nnnn-nnnn, where xx is the carrier selection code. Since international telephone numbers can have up to 15 digits, the maximum number of digits to be dialed is 19.
For example, to call the number 555-0123 in Washington, D.C. (area code 202), United States (country code 1), using TIM as the chosen carrier (selection code 41), one would dial 00 41 1 202 555 0123.
Again, selecting a carrier can be tricky, since they charge different rates, not all of them operate in all of Brazil, not all forward international calls, and some do not put calls through to some remote or rarely called countries. ANATEL's Web site has a useful on-line system (in Portuguese) where the standard rates of all available carriers can be compared for the particular international call one wants to place.
As of January 2009, Embratel is the only carrier offering operator-assisted international calls, by dialing 0800-703-2111. International telephone number inquiries can be made dialing 0800-703-2100 (same number as for domestic directory inquiries). Embratel also offers radio calls to sea vessels in Brazilian waters by dialing 4004-2103, in addition to INMARSAT service, which works like any regular international call and can be placed through any major long-distance carrier.
Read more about this topic: Telephone Numbers In Brazil, International Calls