Great app for making Wi-Fi calls while overseas – 1SIM VoIP Review

As a OneSimCard user, this app lets me call back to the US for just 2c/min from any country when I have a Wi-Fi connection. And I don't even need to have my OneSimCard international SIM card installed to do it! Calling to other countries is also cheap and usually less than Skype.
Review by 1ill8 on 1SIM VoIP.