Telephone numbers in Nigeria
Telephone numbers in Nigeria use an open numbering plan. They are composed of a combination of an area code and a local line or subscriber telephone number. Area codes consist of one digit (Lagos, Ibadan and Abuja) or two digits. Local telephone numbers contain from five to seven digits, and may vary within the area code. Mobile phone numbers start with 070, 080 or 081, 090 or 091 and are followed by eight digits. Calling formats 
These examples use calls to Lagos as example:
 xxx xxxx – Calls within an area code
 01 xxx xxxx – Calls from outside Lagos
 +234 1 xxx xxxx – Calls from outside Nigeria
 0xxx xxx xxxx  – Calls to a mobile number (see below)
 042 xxx xxxx – Landline calls to Enugu. 052****** – Landline calls to Edo. 064 xx xxxx - Landline calls to Kano. Mobile network prefixes 
The following prefixes are assigned to mobile phone network operators. Nigeria implemented mobile number portability in 2013. Therefore, prefixes no longer reliably indicate the parent network of a number. Area codes

See also
List of telephone operating companies in Nigeria

References

External links
ITU allocations list

 
Telecommunications in Nigeria
Telephone numbers
Nigeria