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You probably know that Skype is a great way to save money on voice calling. You can call PC-to-PC for free and even video chat.

Skype isn't just for computers, though. You can also use it on your smartphone or tablet. Make voice and video calls over Wi-Fi or 3G. Just as on your computer, it's free to call other Skype users.

Skype can run in the background. It will notify you when someone is calling. You can also use Skype instant messaging when you can't talk.

Cost: Free

iPhone Link: