Where in North America is area code 205?

North American area code +1 256 is in northern Alabama, including Huntsville, Decatur, and other towns.

International country code +256 is Uganda.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.)