Works fine, without some problems, but I have question: if some one connect to my BT (it is trusted device of course) I only see the change color of BT icon, but i dont see the icon of cennection to GSM (GPRS,EDGE,..) but internet works on connected device thru my N900. How i can discover if someone is connected to the internet and download my data?

To monitor the actual establishment of a data connection, you'd need a separate, non-existent, utility. I'm investing this.