I have an IBM T41 notebook that came with an MDC (modem daughter card) in its CDC slot. I see many BMDCs (bluetooth/modem daughter cards) for sale on eBay dirt cheap and was considering getting one. However, I've read that you can't just slap any old daughter card into a CDC slot and expect it to work; it's reliant on the BIOS being able to talk to the hardware on the card. I know that one could get T41s with the BDMC installed, though, and I'm wondering if putting another T41's BMDC into mine would work?
I threw some caution to the wind and ordered a BMDC off of eBay using part numbers listed on this ThinkWiki page for about $4~5. Snapped it in, booted up, downloaded and installed drivers from IBM's support site, hit Fn+F5, and boom, it works! A resounding yes!
Though, my T41 didn't have a bluetooth antenna in it since it didn't ship with a BMDC, so I have to place my phone directly over the chip to get them to talk until I get my hands on an antenna.