It's rude, it's a drop-vector, it's slightly crap (UK phone networks don't use NITZ so your phone's clock is probably wrong anyway, unless it's rooted and has a time sync app on it (which is something I had to do way back when I had a Nexus One, because the clock drift on that thing was incredible - literally minutes per day), it's rude, and god damn it just wear a fucking watch if you want to know the time that much.
As for security - yeah, I hear ya. We'll have to see how that turns out.
As for security - yeah, I hear ya. We'll have to see how that turns out.