Any pattern in the way you behave can be used against you. If you are not emitting a mobile phone signal, then you are suspicious. If you have an iPhone, and the logs suggest you regularly take the batteries out, then you are very suspicious. A modern spy would carry a mobile phone - not the latest security recommended one, but something dull - and would tweet and post pictures of what they are eating and listening to just to get the right watch profile. You would have to leave the phone behind when you want to do Spy Things, but you could leave it in the locker at the swimming pool, or something plausible like that. If you have to send crypto messages over this phone, keep the message very short, and plausible.
I don't think there are many real spies here on Slashdot, but there are probably people who would like to keep their data secure in a way that does not attract attention to themselves. Perhaps we should all use encryption whether we need it or not, so those that need it will no longer stand out.