Should data roaming be on or off?
Apply the provider’s instructions to the cruise eSIM and check your home SIM separately.
Treat each SIM separately
The cruise eSIM may require data roaming to connect. Follow its supplier’s exact instructions. Turning roaming on for the wrong line can expose you to your home carrier’s charges.
Check automatic switching
Disable automatic switching to your home data line if you do not intend to use it. Turning off home-SIM data roaming does not determine the price of calls or texts: check those services with your carrier.