Calling Niger from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 227 - Country Code for Niger
• Phone Number - 8 digits
• US to Niger landlines international dialing format: 011 227 20 ??? ???

How to dial to Niger cellular:

• dialing format for calls to a cell phone: 011 227 9? ??? ???

Phone Books:

• Niger business directory - from Africa Phone Books