Area code +243 1 (or 01 in domestic format) is Kinshasa in the Democratic Republic of Congo (formerly Zaire).
(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 Bandundu, the Democratic Republic of the Congo is 243, (0)3.
The country code and area code of Kinshasa, the Democratic Republic of the Congo is 243, (0)1.
The country code and area code of Kivu, the Democratic Republic of the Congo is 243, (0)6.
The country code and area code of Lubumbashi, the Democratic Republic of the Congo is 243, (0)2.
The country code and area code of Province Orientale, the Democratic Republic of the Congo is 243, (0)5.
Congo has two countries often referred to as "Congo": the Republic of the Congo and the Democratic Republic of the Congo (DRC). The nationality code for the Republic of the Congo is "CG," while the DRC's nationality code is "CD." These codes are used in various international contexts, such as vehicle registration and internet domains.
The country code and area code of Hamchon, Democratic People's Republic of Korea is 850, (0)9.
The country code and area code of Pyongyang, Democratic People's Republic of Korea is 850, (0)2.
The country code and area code of Niari, Congo is 242, 25.
The country code and area code of Pool, Congo is 242, 23.
The country code and area code of Sangha, Congo is 242, 22.
The country code and area code of Pointe-Noire, Congo is 242, 29.