Calling Sudan from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 249 - Country Code for Sudan
• Phone Number (may not begin with 0) - 9 digits
• US to Sudan international dialing format: 011 249 1? ??? ????

How to dial to Sudan cellular:

• dialing format for calls to a cell phone: 011 249 9? ??? ????

Phone Books:

• Yellow Pages of Africa - currently offline