Skype for iPhone

At long last, the iPhone and iPod touch have a Skype client all their own. This is a momentous turn of events, particular for iPhone users who haven't opted for AT&T's unlimited voice plan and want to save their precious minutes. iPod touch users will, of course, welcome the chance to add any sort of calling capability to their mobile device.

This mobile version of Skype looks and acts like the iPhone dialer--it might even cause some users to do a double-take. Quick chat sessions, powerful integration with the desktop version of the Voice over IP application, and better-than-expected call hosting make Skype for iPhone a must-download, even if it is missing some features.

VoIP services such as Skype offer the promise of free phone calls--provided you're calling other Skype users. Otherwise, you pay a few pennies per minute for international calls, voice mail services, and calls with anyone who is "out of service" (that is, those with a regular landline or cell phone not using Skype). You fill up your account with credits and away you go. Skype also offers a monthly unlimited plan that includes voice mail for just US$3 a month in the U.S.

The app mimics the iPhone dialer--in fact, it looks nearly indistinguishable. You can create an account on your iPhone, although once you are registered, the client itself only allows you to make calls, view and dial contacts, and send text messages or chats. To configure any other settings--or to buy more credits--you must use the iPhone's Safari browser or any browser on your Mac.

The beauty of using Skype is that you can view call and text message history, review charges, and listen to voice mail messages on your Mac--even if you receive them on the iPhone.

Skype's iPhone client only lets you make calls over Wi-Fi, not 3G or EDGE. (In fact, this restriction has raised the hackles of some advocacy groups, who have called on the Federal Communications Commission to investigate.) With the ability to make free or almost free calls comes a major caveat: call quality depends greatly on your service provider. During a day of testing on a home broadband line, most Skype-to-Skype calls were clear, but a few times there was an annoying delay or a digital chirp. In a lengthy call to a Skype user in Australia, the call quality slowly eroded over time. At a public library, Skype quality was fine during one part of the day, and then--when everyone around me was tapping away on laptops--Skype for iPhone was almost unusable.

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