DeviceID consistency system.getInfo("deviceID")

Hi, As mentioned on the api page http://docs.coronalabs.com/api/library/system/getInfo.html#deviceid
getting the device ID calling system.getInfo(“deviceID”) is not guaranteed to be stable in different sessions.

Does someone know under which cirsumstances would this ID change?
It seems strage to me. Isn’t it the unique identificator for each device? Why would it change?

Thanks! [import]uid: 76413 topic_id: 28406 reply_id: 328406[/import]