South Sudan is country code +211.
(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, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The country code and area code of Abri, Sudan is 249, (0)244.
The country code and area code of Adeela, Sudan is 249, (0)716.
The country code and area code of Alti, Sudan is 249, (0)544.
The country code and area code of Argo, Sudan is 249, (0)243.
The country code and area code of Aroma, Sudan is 249, (0)412.
The country code and area code of Atbara, Sudan is 249, (0)211.
The country code and area code of Awiel, Sudan is 249, (0)844.
The country code and area code of Babanusa, Sudan is 249, (0)641.
The country code and area code of Bantio, Sudan is 249, (0)861.
The country code and area code of Barakat, Sudan is 249, (0)516.
The country code and area code of Beika, Sudan is 249, (0)519.
The country code and area code of Buram, Sudan is 249, (0)714.