Can you tell me the hotel fax and phone numbers, please?
we use "numbers" and not "number" here. Is it because it's fax and phone. So two numbers, thus the plural?

Thanks.

Question

Can you tell me the hotel fax and phone numbers, please?
we use "numbers" and not "number" here. Is it because it's fax and phone. So two numbers, thus the plural?

Thanks.

Answer

If they are on different numbers (or we assume they are), then yes, it must be plural.