even if using RadioInfo methods for checking transmission activity-i need to know when should i start checking it.. (that was the reason why i asked is there a possibility to check when user starts using an application which connects to the internet). i was thinking about writing a timer which will call getNumberOfPacketsReceived()/Sent() methods every second so that i can register the transmission activity.. but i do not think that putting it into timer is very efficient way of doing it.. i just do not have any idea.. :/