I have some questions as to how it works now that the minutes for Free At Sea are 150min for 2 guests. So the credit given if one passenger chooses to purchase the upgrade should be less, but you'd keep the login with the 150min for the second passenger.
Is the price given online to prepurchase the upgrade different to the price onboard (for the first day)? Would there be any advantage to doing this onboard? (credit applicable to a different plan? credit might be used for the plan for 2 devices?)