The telephone area code for Calabar, Cross River, Nigeria, is 087, or +234 87 in international format. The local number is a further 5 or 6 digits.
(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 zip code for calabar, crossriver state in Nigeria is 087.
The country code and area code of Aba, Nigeria is 234, (0)82.
The country code and area code of Abakaliki, Nigeria is 234, (0)43.
The country code and area code of Abeokuta, Nigeria is 234, (0)39.
The country code and area code of Agbor, Nigeria is 234, (0)55.
The country code and area code of Ahoada, Nigeria is 234, (0)86.
The country code and area code of Akure, Nigeria is 234, (0)34.
The country code and area code of Asaba, Nigeria is 234, (0)56.
The country code and area code of Awka, Nigeria is 234, (0)48.
The country code and area code of Azare, Nigeria is 234, (0)71.
The country code and area code of Bauchi, Nigeria is 234, (0)77.
The country code and area code of Enugu, Nigeria is 234, (0)42.