From thinkmobile (http://www.thinkmobile.com/News/00/56/66/);

"Handheld maker Handspring (Quote, Company Info, News) announced a free software upgrade that will make its Treo 90 organizer compatible with Secure Digital Input/Output (SD I/O) expansion cards"

The 9210i supports secure memory cards, is there any chance that the 9210 can be made to do likewise? Come on Nokia!

8) upgrades!!! 8) upgrades!!! 8) upgrades!!!

That'd be some effort.... Squeezing an SD card into a 9210..... As for the question: Any reason why not? Yes: it's too thick.

As Dr_Flash mentioned, it's probably not possible. SD cards are bigger than MMC; you'd never get it into a 9210 without breaking something...I know - I almost killed a friend's MP3 player (which had MMC-only support) by trying to force an SD card into it!