We have heard reports of a BlackBerry Connect 4.0 client for WM5 and WM6 devices.
The first link on Google after searching for "WM6 BlackBerry Client" lists this page, which says it contains the software!
http://www.sems.org/entry.asp?ENTRY_ID=225
All I can suggest is try it out.
From what we have heard, this only works if you have BES server software, it won't work as a single standalone BlackBerry, and of course you will need a BlackBerry activated SIM from your Network, I don't believe a standard phone SIM is enough.
If anyone tries this out and has success, please post back here as I'm sure other users will be interested to see if it works!
Parent poster will have to check with the Cypriot Network Provider for the BlackBerry services SIM before buying though!
Regards
Ivan