I tried Siri the other day...
I said (in a clear British accent) "What time is it?"
"I don't know what the time is at 32 minus 45 moody street"
1) It doesn't matter what the time is in Moody Street, just knowing I'm in the UK would be good enough, and you can work that out from the cells with no need to reference wifi or GPS info.
2) We say "32 to 45" not "32 minus 45" for an address which spans multiple numbers
3) I wasn't anywhere near s*dding moody street!
So overall I wasn't particularly impressed.
Although I did manage to successful sneak a "wake me at 4am" into the phone, which belonged to a friend.... Haven't spoken to him since, so I might be in trouble, then again, this is an iphone alarm, so it might not have gone off yet!