Social Impact Edition - Where do I enter company phone number

I am using Social Impact Version

I cannot find a field for 'Phone Number'

I am in Setup - Company - Company Information

I expect to see a field called 'Phone' but it is not there.

If I go a a FF edition of NS, I can see the field, but I cannot see it in any of my Social Impact versions. I can see Fax, but not Phone and there is no way I can Customise the screen to include phone number.

Unfortunately they want Fax and Phone to appear on their invoices, otherwise I would use the Fax field as the Phone