Operator has a "Send to Bluetooth device" option that uses the Bluetooth File Exchange functionality of OS X (and similarly in Windows?) to send hCards and hCalendar events to mobile devices - cell phones, PDAs etc.
This page lists tests and results for different devices.
How to test your device
Use Operator to try to add hCards or hCalendar events to your handset over Bluetooth, then add it to the wiki to say whether it passed or failed.
Motorola V3 ('RAZR')
The V3 RAZR does not support the vCard 3.0 implementation oused in Operator and X2V but requires vCard 2.1. If one uses vCard 2.1, it seems to work fine. The RAZR does not support being sent hCalendar events using Operator.
Palm T|X PDA
The T|X does not support hCard or hCalendar import through Bluetooth.
Sony Ericsson W810i
The W810i supports both vCard 3.0 and vCard 2.1, but does not transfer the 'fn' field properly. It has also choked on some of the 'type' data it has seen in the wild.
The W810i did not want to add an hCalendar event from the past. I tested it with this event and it said "Cannot add appointment", but I did already have it in another calendar. I tried another event and got the same result. It seems the W810i does not support "Send to Bluetooth device" for hCalendar.