[maemo-users] how to pronounce "770", "N800" and "N810"?

[From: Antonio Orlando]

Which is the right pronounciation for "770", "N800" and "N810"?
When I speak, I don't know how these names have to be pronounced correctly.
That is, e.g. for the 770, Nokia staff uses in presentations:

1) seven-seventy
2) seven hundreds and seventy
3) seven-seven-zero
4) seven-seven-O
5) other

Same doubts for the other two models' names.

-- 
Antonio