How to fax from i-phone

There is no way to directly fax from a cell phone. There are some online services that will allow you to email or upload a document and they will then fax it. Many of them have trial periods.

If you have an AirPrint-capable printer with faxing capabilities that is also connected to a landline, you might be able to use that.

To send a fax you will need to go through a 3rd party service. Look in the App Store.