Which are the correct prepositions?

[Tan Elaine]

If you are interested in being a private tutor, you may/can call Joseph at/on 62883372.

Which word in bold in each case should I use? I think in either case, both words can be used. Are my choices correct?

Thanks.

[bhaisahab]

If you are interested in being a private tutor, you may/can call Joseph at/on 62883372.

Which word in bold in each case should I use? I think in either case, both words can be used. Are my choices correct?

Thanks.

Yes, both are OK.

[emsr2d2]

If you are interested in being a private tutor, you may/can call Joseph at/on 62883372.

Which word in bold in each case should I use? I think in either case, both words can be used. Are my choices correct?

Thanks.

They are all OK but my personal preference would be:

If you're interested in being a private tutor, you can call Joseph on 62883372.

or

If you're interested in being a private tutor, please call Joseph on 62883372.


I would use "at" with an email address:

If you're interested in being a private tutor, you can email Joseph at joseph@nonsensemail etc etc