Ive used it once. The first 2 attempts last night did not go through and I knew the fax # was working. I tried again this morning before anyone was in the office and then it worked. For now, mixed feelings. I also ended up buying the same credit twice because it didnt update on time. On the fence but glad to be able to fax from my phone and not have to get on a desktop.
Update: Works great now. Glad to not have to be on a desktop or actual fax to fax. It works better if you load docs from photos. I had issues loading from dropbox so I just took pics of the document on my phone screen and used it that way.
Folaket about Tiny Fax: Send Fax From iPhone, v3.5