AWFUL customer service
I was able to send a fax but receiving a "free" fax during the trial, was awful. It never happened and after sending everything they requested (receipt for purchase-even though I was emailing them so clearly I had the app). 6 emails from them later and I uninstalled the app and wasted money buying credits for half the function. I think they were stalling giving me the functionality of the "free" fax number to receive faxes until the trial was over and they got the $17.99.
GisGyrl about
iFax - Send & Receive Faxes, v6.0.13