sorry to break the bad news but u r doomed in this case. Every "service" of that kind in europe requieres and "sms text message" approval. That means in order to track the phone (has to have gps) , to send the text and then the other person has to confirm that she wants to be tracked , very poplular service in my country to track your kids (in this case you program it yourself)
Where can I find this service?
After the sms approves the tracking does it show that the phone is being tracked?
Does it work with the phone off (as long as it has battery of course)?