How to copy SMS messages from a Nokia phone (or Nokia PC Suite backup) to iPhone?
Please check iNoki at: http://www.nokisoft.com/inoki. It's an iPhone app which can extract and import data in .NBU file created by Nokia PC Suite. All phonebook, sms, calendar, photo, audio, videos can be imported.

AppStore link: http://itunes.apple.com/us/app/inoki/id438619967?ls=1&amp;mt=8

SMS is viewable in iNoki instead of native SMS app - for apple has no official API to insert into native SMS db.