nine-one-one vs. nine-eleven?

[emckean at ENTERACT.COM]

Is there any info on who says nine-one-one and who says nine-eleven?
Regional? Socioeconomic? EMT folks vs. the rest of us?

I'm thinking it's just personal preference, but I heard a Denver-based
reporter say "nine-eleven tapes" on NPR this morning and it struck me.

In the UK, do folks say "nine-nine-nine" or something else?

Erin McKean
editor at verbatimmag.com