MoonStar Dialer
The MoonStar dialer is a free VoIP dialer supports IDD calls and lets you call your friends directly with a free VoIP account. It utilizes WiFi if available and connected or can use the mobile phone service when there is no WiFi available. Compatible with iPhone 4S or later.
Summary of Features
•No service subscription is required to make calls with your friend
•Uses internal contact list
•Registered Status
•Network Quality Indication