Like the article says, either turn it off or put it on "vibrate":

A couple of years ago we reported on the Jamaican mobile phone thief who got herself into a bit of a sticky situation in Negril when "a cellular phone which was stolen from a female shopper was found after it rang from within another shopper's vagina".
...
You'd think that this cautionary tale would be enough to deter even the most desperate mobe-lifter, but they obviously don't read Jamaica's Western Mirror in Romania, because light-fingered Ruxandra Gardian has been snared by the same "let's dial the number and see where she's stashed it" ploy.

I mean, cell phones are small, but I can't recall seeing one that small. 9 kinds of yuck going on there!