The following is the procedure for dialing various destinations in the Federal Republic of Nigeria
| Local Calls | Dial Directory Number of the wanted subscriber. It may consist of five (5) digits as in the Wukari Area or six (6) digits as in Enugu Area, or seven (7) digits as in Abuja Area. | |||||||||
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| STD Calls | Dial Trunk Prefix "0 " followed by the Trunk Code of the called numbering area, and followed by the Directory number of the wanted subscriber. In other words, dial trunk prefix "0" followed by the National number of the wanted subscriber as shown below;
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| International Calls | For subscriber dialing international traffic, the International Trunk ("009") prefix is dialed followed by the country code for the destination country and then the wanted subscriber’s national number.
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| Incoming International Calls | For example, from Germany to a subscriber in Ibadan (Nigeria);
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| Border Calls | For border calls from Katsina to Maradi (Niger Republic) and Sokoto to Birnin Nkoni (Niger Republic) the prefix "9" has to be dialed from the subscribers of Katsina or Sokoto. After the Prefix "9" the subscriber number of the subscriber of Niger Republic follows. |