Calling Uruguay from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 598 - Country Code for Uruguay
• Phone Number (may not begin with 0) - 8 digit phone numbers
• US to Uruguay international dialing format: 011 598 ? ??? ????

How to dial to Uruguay cellular:

• dialing format for calls to a cell phone: 011 598 9 ??? ????

Starting digit for landlines:

• Montevideo: 2
• All other areas: 4

Phone Books:

• Paginas Amarillas - Uruguay Yellow Pages, in Spanish
• Guias.com.uy - people search, in Spanish

Updates:

• Uruguay telephone numbering changes - August 2010