All Digicel prepaid accounts are pre-provisioned for roaming. There is no need to contact customer care for activation. For a postpaid customer we would suggest first contacting customer care with verification in the form of your security question and answer and letting the rep know that you would like to have roaming enabled.
To get more information on activating roaming, click here: DigicelPNG Roaming.
To set up roaming on your device click here: Digicel Phone Guide.