The tel. number should come with your docs, but just in case...

I pulled these from i-cruise.com:

Norwegian Cruise Line - Ship Telephone Numbers
Leeward 335-547-010
Norway 110-4603
Norwegian Crown 110-4673
Norwegian Dream 130-5510
Norwegian Majesty 133-6560
Norwegian Leo 110-4601
Norwegian Sea 110-4601
Norwegian Star 110-4503
Norwegian Sun 800-870-1261
Norwegian Wind 130-5713