Did you have BlackBerry Protect installed on your device? If so, you can try to use the Location feature to try to locate your device. Go to http://blackberry.com/protect, log in using your BlackBerry ID and then use the locate feature. If the software is unable to locate your device, or if you did not have BlackBerry Protect enabled, I'm afraid there is little that can be done.
Make sure to contact your wireless service provider to report the lost device and they can at least block the device from connecting to their network if your carrier offers that as an option.
Sorry there is little more that can be done.
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