I am not sure but I tested Prey with my N9 a year ago and was displeased with this service because you have only limited possibilitys and a limited number to do some actions (If I remeber it right I could track my N9 only one time (what even didn't work - sure the N9 client is not official and not fully functional) and had to pay to do further actions - but I am not sure anymore). I would love to see a free service/client which works via sms like SMSCon for N900. This would be the best solution.