The telephone country code for Nigeria is +234. Nigerian telephone area codes do not correspond exactly to state lines, so the area code you need depends on what part of Anambra State you are calling. For example, the capital Awka is in Nigeria's area code 048, which is +234 48 in international format, but Onitsha is in area code 046 (+234 46).
(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.)
It depends on which city or town in Osun you are calling.
23480 is a Nigerian mobile telephone.
Nigeria is country code +234, and Auchi is city code 57.
100005 is the post code for the Agege area located in Lagos, Nigeria. Lagos is the largest city in Nigeria.
Area codes in Nigeria are by town, not by state.Aba, Abia, Nigeria, is in telephone area code +234 82Umuahia, Abia, Nigeria, is in telephone area code +234 88(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.)
Telephone area codes in Nigeria do not strictly follow state lines.The area code for Port Harcourt, Rivers, Nigeria, is 084, or +234 84 in international format.The area code for Aba, Abia State, Nigeria, is 082 (or +234 82); it probably includes part of Rivers State.The area code for Yenagoa, Bayelsa State, Nigeria, is 089 (or +234 89).(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.)84
234 is the international country code for Nigeria - however - I can't find any reference to an area code starting 81 !
The telephone country code for Brazil is +55, and the area code for entire state of Roraima, is 95, or +55 95 in international format.
North American Area code 605 is the telephone area code serving the entire state of South Dakota
The area code for Warri, Nigeria, is +234 53. Within Nigeria, dial 053.
The country code for Nigeria is +234. Ogbomosho is in Oyo State, so it is most likely in area code 38.
The country code and area code of Aba, Nigeria is 234, (0)82.