Calling China from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 86 - Country Code for China
• Phone Number (may not begin with 0):
  • fixed - area code (2, 3 or 4 digits) plus local number can total 8 to 12 digits, with 10 and 11 digit numbers being most often used
  • cell phones - 11 digits, 1 is always the first digit
• sample call from US to a landline in Guangzhou: 011 86 20 ???? ????

How to dial to China cellular:

• dialing format for calls to a cell phone: 011 86 1X? ???? ????
• X can be any digit from 3 to 9

Area Codes:

Phone Books:

• Yellowpages-China.com - business directory, access to some details requires a fee
• Useful phone numbers - provided by 86CallChina