Yes - I suppose you could just use a second phone in a different pocket! The weird thing is I found the very thing a few years ago - from memory, it was a little USB chargeable Bluetooth fob with a single button on it. You pressed the button and your phone rang - there was nobody there of course but you'd already have the excuse to rush off. I think I emailed a link to someone so it might be in my DeletedItems at work.