Pay phones can be found throughout the island. Some accept only phone cards, which you can buy from the main visitor centre, at the airport, in shops and from the Cable & Wireless office on the Carenage.
The general post office (Mon-Fri 8am-3.30pm) is on Lagoon Road in St George's and there are smaller offices in towns and villages on Grenada, Carriacou and Petite Martinique.
You'll find a couple of internet cafés in St George's and one on Carriacou.