Originally Posted by John Clark
You can transfer the numbers (one by one) to the sim. However, all you get is one name and one number with sim card storage. There is a Bluetooth Address Book Transfer but it doesn't work with all BT devices. If you can get them paired you can try the address book transfer feature but don't be surprised if it doesn't work.
Tried this with my 8800 and my N75. It allowed me to transfer my phonebook, but when I checked the N75, it only had one business card that transferred. It's sad that a great device like a BlackBerry doesn't have a simple feature like transfer contacts to sim.