I read allot about this topic about tap a phone even when its off.

My question is, is it possible that for example the FBI can activate the mic in my n900 and listen to conversations even when the phone is off?

Some people say it can other say it cant.

Strange fact is still that my n900 can wake it self even when off, batterygraph shows CPU activity even when n900 is off and all that sort of things.

Can someone tell me if it is possible to externally activate the n900 through a signal? can this be tested? is there some one who can measure radiation to test if the n900 sends signals even when off?