And sometimes your local emergency number is pre-programmed on your phone and you don't even know it!
Just yesterday I found that out unexpectedly with my Cingular 8125 - purely by accident, which is not really a good thing.
I decided to set up some speed dial numbers on my 8125, though I rarely use speed dialing on my cell phones; I normally use voice dialing instead.
Anyway, when I entered the speed dial setup screen, I noticed that the first three had been pre-programmed by Cingular. 1 and 2 were my voice mailbox and Information (411 here in the USA) respectively. However the third was simply labelled "Voice Connect", and the corresponding phone number was "08". I honestly had no idea what Voice Connect was. So of course I did what anyone would do - I dialed it.
I didn't understand what the person who answered said at first, so I asked him to please repeat it - and then I heard him say clearly, "This is the XXX County 911 Emergency Center." Ouch!! 8O
I apologized and told him I had dialed an unknown speed dial number on my cell; he laughed and said it was OK. I imagine I was a nice shade of pink by then!

ops:
So.... Now I know, at least. :|