Hi, I like Fongo but it is very slow. What I mean is, when I end a call (or trying to), I press the "end" button, nothing happen and I can't close the line. Even if I press the button several times, it won't work. It will happen eventually. The same with other functions like pressing the button such as speaker, I have to press the button several times before I get it.
Another problem is that when I receive a call, there is a delay of several seconds before the caller can hear me. It is very annoying.
By the way, I have an Apple iPhone 6 with the latest version of of iOS. I use data only for my calls. Thanks.