activate radar detector in nokia phones

 go to menu>settings>security settings>closed user group>Select on>Enter 00000>Press ok 

Clear back to normal, within a few seconds
your phone will display a radar sign with five
zero's next to it. It is now activated:)

only Nokia phones have this
function. Cell info display needs to de-
activated. Settings>Phone Settings>Cell  Info display
Each time you turn off your phone, or even each
time you loose contact with your carrier, you'll
have to activate it again... It is done by steps
1 through 5, the number (00000) will be
already on the field as default.