Calling Panama from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 507 - Country Code for Panama
• Phone Number:
  • fixed - 7 digits
  • cell phones - 8 digits
• sample call from US to a landline in Colon: 011 507 4?? ????

How to dial to Panama cellular:

• dialing format for calls to a cell phone: 011 507 6??? ????

Leading digit for landlines:

• Panama City: 2, 3
• Colon: 4
• Bocas del Toro, Chiriqui: 7
• Cocle, Herrera, Los Santos, Veraguas: 9

Phone Books:

• Paginas Amarillas - Yellow Pages
• Guias Telefonicas - print like versions of Panama White Pages and other directories, in Spanish