Book Modify is no longer available. I tried it myself yesterday and last week.
You might try this though..
You can go on to the website (Carnival) and bring up your cruise (you will need your booking number). Then, complete your boarding pass online (this seems to be the only screen that brings up this info). When finished, in the same screen, choose gifts. It will ask for your booking number, last name, ship, sail date. Then it will bring up the big list of goodies you can buy. Just click on something as though you are ordering, it will then bring up your booking and cabin no. Sometimes though it will still say Guarentee.
Someone else might know of a shorter way. I tried just picking gifts and putting in my booking number and the cabin no. was still blank. It did not fill in...
On Glory - 05-06-06
Sensation,Jubilee ,Maj.of the Seas,Conquest, Victory.
I FOUND OUT BY LOOKING ON THE DOCS -- THE SAIL & SIGN PAGE -- ON THE BACK -- IS A COMPUTERIZED # THAT HAS YOUR BOOKING # AND THEN A 4 DIGIT # --THE 4 DIGIT # AFTER YOUR BOOKING # IS YOUR A CABIN #. HOPE THAT HELPS.
I booked 6a guarantee on sensation 2/26/05 .I did as Topcat suggested but also had to go to funpass from home page like slyre . Found that I have been upgraded from 6a to 6d room # e91 . Looks like a wonderful upgrade. Emperess deck below front dining room. FIRST TIME CRUISER !!!! Can not hardly wait !
Dave, upgrades at the pier at almost always unavailable but if you can get one you will pay the differance which could be anywhere from $50pp to go up a deck to $100s to upgrade to a outside, balcony etc. The secret is to ALWAYS book the cat cabin that you will be satisfied with even if you get the very worst location in that cat. If you want an outside, book and outside and do not depend on an upgrade. Same for balcony, You want one, pay for it. Do not buy an inside or outside and figure you will get an upgrade to a balcony..