My mobile rang yesterday, a number I didn't know, and when I answered, a woman said "Who's that?", sharply. A bit taken aback, I said "My name is Sue, who are you?" and she said, a little fiercely "well, that's my mobile your on, that went missing at the weekend". So I said, "er, no, it's mine. What number did you call?" and she said "07786..." so I cut in and said "sorry, this is 07760, you've got the wrong number" and then she was quite apologetic, but for a moment there, caught off guard and at the end of a tiring day, I found myself thinking "oh, god, I've stolen this woman's phone!..."