Another urban myth dispelled

I spent much of yesterday's flight back from London tut-tutting to PJ about somebody having their mobile phone on (yes, I'm so much fun to travel with). I kept hearing the tell-tale three-tone "turn-on" noise, and conveniently blamed it on the children sitting a row ahead of us. When we got home, however, I discovered -- to my shame -- that it was MY phone making the noise: I'd turned it on on Friday evening after landing and never actually turned it off. Oops. I'd apologize psychically to the children, but eh -- they were really irritating anyway. And it's good to know that my phone didn't actually interfere with aircraft systems -- this time.