Love the Fongo!
I tried out Fongo when my Wind cell phone kept dropping calls. I love this app. The calls are crystal clear and free if they are local or between Fongo users. I am able to use the same phone number on my iPhone and my tablet. I also love that I am supporting a Canadian start up company instead of a mega corporation. Totally recommend you give it a try.
Wind refugee about
Fongo - talk and text, v3.9.5