Awesome! I agree that I need to improve the cost discoverability. The problem is the matrix of rates is huge. In some countries, costs are different per mobile provider, and landlines are usually half the cost or less than mobiles. For example, calling Serbian landline to the US would be roughly $0.20 per minute. Serbian mobile to the US would be roughly $0.55 per minute. That all changes when you call somewhere else.

Of course many countries are not nearly so much. I also do plan to add voip calling within the app. This would allow you to skip the high cost of crossing Serbian boundaries when you're near a decent internet connection, but give you flexibility to make calls directly over the PSTN when needed.