Media5-fone
From VoIP.ms Wiki
Configuration Setup
Download the Media5-fone from the Android Market or the Apple App Store
*Start the application -Click on More -Settings -Configure SIP Accounts
*Click on the + sign on the top right corner -Click on Internet Telephony Service Providers, Preconfigured List
*Select one of the VoIP.ms servers.
*Configure your VoIP.ms username: 100000 (Replace with your VoIP.ms username) *Configure your VoIP.ms Password:(Your account password)
*Click the DONE button. *You should be ready to make calls