GSM protocol information
did you know.....
That there is a pert of the GSM protocol (available publicly) which shows that all gsm phones can be switched on so that the microphone becomes active, and transmits, and this can be activated by the relevant authourities (SP) even when the phone appears to be switched off. Therefore the only way to make sure that your phone is definately not active is to take the battery out.
If you dont belive this, then you can read the published protocols, but i can promise you that it is exeedingly dull reading
NB