Calling Cameroon from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 237 - Country Code for Cameroon
• Phone Number - 9 digits, the leading digit for fixed lines is 2
• US to Cameroon international dialing format: 011 237 ???? ?????

How to dial to Cameroon cellular:

• dialing format for calls to a cell phone: 011 237 6??? ?????

Phone Books:

• Cameroon Phone Book

Updates:

• Cameroon telephone numbering changes - November, 2014