Skype's native VoIP client for iPhone, the Skype for iPhone app will finally be available as free download from the iTunes App Store, begining Tuesday. It includes chatting as well, though Skype's VoIP calling is free to other Skype users and an inexpensive per-minute fee to landlines.

Skype's screens are well organized and use iPhone's ability to add filters, for instance, to sort your contacts alphabetically, or by who's online. Calls on Skype for iPhone work only if you're in range of a Wi-Fi network. If connection is solid, you can dial a number or quickly call a contacts stored in your address book. iPod Touch users will need earphones with an embedded mic to talk. During a call, you can mute the line, go on hold, or put the call on speakerphone. In the My Info window, you can follow a link to buy more SkypeOut credit online.

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