Telephone numbers in Nigeria use a combination of area codes and personal numbers. Area codes are one digit (Lagos, Ibadan and Abuja) or two digits. Local phone numbers contain between five and seven digits. The length of a phone number can vary within an area code. Mobile phone numbers start with 070, 080 or 081, 090 or 091 and are followed by eight digits.
The following prefixes are assigned to mobile phone network operators.Nigeria implemented Mobile Number Portability in 2013. Therefore, prefixes no longer reliably indicate which network a phone number is on.