Same password on two mobiles of two friends

Very recently I picked by accident the mobile iphone, (the same as mine) of a friend and ran my 4-digit (not same number and not consecutive numbers) password and unlocked the phone. At first I did not realise because I thought it was my mobile, until my friend sitting opposite at a dinner table who had seen me taking her phone, said to me. "How did you know my password?" to which I replied that "I did not". And ofcourse we then both realised that we had the same four-digit password in our identical iphones. It is interesting, in the first place, that we found that out about this amazing coincidence, but more exciting was the fact that we had the same four-digit password!!! Now what are the chances of such a thing happening?
Total votes: 682
Date submitted:Sat, 14 Jan 2012 08:42:17 +0000Coincidence ID:3511