For calls placed within Grenada, Carriacou or Petite Martinique, only the seven-digit local number is dialed.
Calls to Grenada from anywhere in the United States or Canada are dialed 1 + 473 + seven-digit phone number.
The 473 area code has been linked to a form of telephone fraud known as the "one ring scam".
The person perpetrating the scam calls the victim via a robodialer or similar means, sometimes at odd hours of the night, then hangs up when the phone is answered with the hope that the victim will be curious enough to call the number back.
[1] When the victim does this, an automatic $19.95 international call fee is charged to their account, as well as $9.00/min thereafter.