If you were calling a lot outside your country. Here's another way for you to show substantial amount of savings on your monthly phone bills. As you monitor you call consumption's that appear on your monthly billing. You may consider of trying other means to make cheap international calls.
Im not telling you to switch yet to Toolani, but to test the waters first and see if you see value after a week or two. Monitor your call reports then it will show you if your saving money or not.
They offer best quality of voice around the globe with more than 100000 happy customers. So how you could prove that by yourself? Visit the site and download the app via apple or google play. So the quality proof is not on my blog or how I tell you. Its in the calling and billing right? Then you should give it a try.