Calling Hong Kong from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 852 - Country Code for Hong Kong
• Phone Number - 8 digits
• US to Hong Kong international dialing format: 011 852 ???? ????

How to dial to Hong Kong cellular:

• dialing format for calls to a cell phone: 011 852 X??? ????
• X can be 4, 5, 6, 7, 8 or 9
• some landline numbers' starting digit is also 5 while most of them begin with 2 or 3

Phone Books:

• Hong Kong Yellow Pages
• PCCW Business and People Search