iPhone app Truphone enables calls via carriers

Truphone, which has an App Store application that enables iPhone and iPod Touch users to make cheap international phone calls via a Wi-Fi connection, now can be used by iPhone users to make cheap calls from anywhere.

Previously, Truphone, which launched as a free application in Apple's App Store in July, worked only when users were within Wi-Fi range. But the latest iteration of the application will allow iPhone users to make cheaper-than-usual international calls additionally via their carrier's cellular voice networks.

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