See the related link for a map of country codes in Africa with a list of many of the city codes (area codes) and mobile codes.
Country codes in Africa begin with +2. With the exception of +20 (Egypt) and +27 (South Africa), all African country codes have three digits.
(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.)
There is no such thing as a "country zip code." The international telephone country code for the Republic of South Africa is +27.
You will need to add the country code (27) for South Africa at the beginning of the number. Like: 1 + 27 + Area Code + phone number.
Telephone area code 015 in South Africa is primarily associated with the Limpopo province. This code covers areas such as Polokwane (formerly known as Pietersburg) and its surrounding regions. It is used for both landline and mobile telephone services in that part of the country.
Chad (the country in Africa) is country code +235.
The country code and area code of Kroonstad, South Africa is 27, (0)56.
Telephone country code +250 is Rwanda, in Africa.
The country code and area code of Bisho, South Africa is 27, (0)40.
The country code for South Africa is 27; the city code for Natal is 31.
The country code and area code of Bethlehem, South Africa is 27, (0)58.
The country code and area code of Ermelo, South Africa is 27, (0)17.
The country code and area code of Grahamstown, South Africa is 27, (0)46.
The country code and area code of Humansdorp, South Africa is 27, (0)42.