In the UK it’s 999. Remember rotary phones and how long it took for the 9 to click all the way round?

here, we've reached the point where all calls are 11 digits- 1+a 3 digit area code prior to the number; it's not terribly complicated in execution- but if you've memorized (not a speed dial on the cell) a number prior and are unfamiliar with the new area code, you're well fucked 🤣