How To Call Guinea-Bissau

from the United States

Dial 011 (the international access code)
then dial 245 (the country code for Guinea-Bissau)
then dial the city code for that phone number (If you don't know the city code, dial 00 to ask the long-distance operator).
then dial the local telephone number
depending on your phone company, you may be able to finish by pressing #, which will connect the call more quickly.