Over crowded user interface
For a call app it is a highly over crowded user interface. For example, the rate icon at the bottom of the app is not necessary. I dont need to check the rate of call everyday. It would be ideal to move it under account in a separate entry called Rates.
Similarly, instead of having a "add to contact" icon at the bottom of Call, it would be useful have access to Recent calls. The "add to contact" could be moved beside dial pad number display, just like native iPhone calling UI.
For more modern clean user interface look at iPhone native calling interface, Rebtel etc.
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Nymgo: International Calling, v5.9.72