Calling Card 4+‎

The ultimate iPhone calling card/IDD dialing application - save money when calling contacts from your iPhone by using one or more cards or carrier prefixes to get the best rates - even have the application automatically select the best card for you based on the selected number. Save money on all your international calls using the most popular calling card application for the iPhone. The application can also be used to route calls through a PBX system (no actual calling card required) or for Skype To Go calls.

Main features:
• Set up multiple phone/calling card accounts and easily switch between them - support for multiple access numbers per card.
• Automatic card selection based on contact and/or number prefix.
• Set up a list of favorite numbers to dial, select any number from your contacts, call a number from the recent calls placed from the application, or directly enter a phone number to be dialed.
• Full support for international prefixes (numbers starting with '+').
• Flexible call details setup allows for automatic dialing of most phone cards even if intermediate menu selections have to be made.
• Display local time for contact to be called (time zone lookup based on the phone number) - support for all international numbers.
• Card definitions can be shared between different devices via simple email export/import.

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Winner "iPhone Apps Excellence Award for 2008" (iPhonefootprint.com)!