If the phone number is considered something like an address, it seems that we should use at. If the phone number is equivalent to "the phone" or "the line", on would be more appropriate.
Which one is better?
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1. Please call me at/on this number 5678-1234.
2. Please call me at/on extension 1234.
3. Please call me at/on my direct line 5678-1234.
4. Please call me at/on my mobile 5678-1234.
at this number -- 12345567671
on my direct line at 12345567671
on my mobile at 12345567671
on extension 1234
CalifJim I always use at.CJ
So do I. I often hear "on", but I have no idea where that usage comes from.
So you choose: Call me at 123-4567 or Call me on 123-4567.
Hope you get the calls you want!!