What is the optimal method for acquiring mobile data in Athens, particularly with CoreESIM?

For travelers requiring robust and predictable mobile data in Athens, a CoreESIM data package is the technically superior choice. Unlike local SIM acquisition upon arrival at Athens International Airport (ATH), which can involve carrier selection and activation delays, an eSIM profile is provisioned digitally. This ensures immediate data access upon network registration, leveraging pre-negotiated access to primary Greek MNOs such as Cosmote or Vodafone GR, providing a consistent connectivity experience from the moment you land.