Booked room in Carnival Cruises & need to upgrade your room so go through the Carnival Cruises upgrade policy & upgrade rooms easily. Carnival Cruises offers several ways to upgrade your cabin, including promotional offers, last-minute upgrade bids, or booking higher-tier cabins directly. Priority upgrades are often available for higher-tier loyalty program members, such as Platinum or Diamond guests. Make a call on Carnival Cruises helpdesk to get upgraded easily.