Sad to say I don't know much about this, but my company is able to erase all data on a stolen/lost blackberry.
And when I remember of the i-Phone 4G Prototype which was bricked by Apple while in Engadget's hands - there has to be a solution.

Could it be the IMEI, which makes it possible to identify the device being "on air" - afaik it is sent every time the device is logged on a providers net ?
Is there a possibility to send commands or skripts not to a specific number but to a specific IMEI ?

CU - M_99