Calling Guinea from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 224 - Country Code for Guinea
• Phone Number - 9 digits for landlines and mobile numbers
• US to Guinea international dialing format : 011 224 ??? ??? ???

How to dial to Guinea cellular:

• dialing format for calls to a cell phone: 011 224 6?? ??? ???

Phone Books:

• Yellow Pages of Africa - commercial listings