With over 500 million user accounts worldwide, <a href="http://www.pcworld.com/businesscenter/article/204803/latest_skype_beta_offers_group_video_calls_for_10.html">Skype</a> is one of the most popular free Voice-over-Internet Protocol (<a href="http://www.pcworld.com/businesscenter/article/206613/the_abcs_of_voip.html">VoIP</a>) services around. Skype is probably most famous for its <a href="http://www.pcworld.com/businesscenter/article/158941/skype_upgrade_simplifies_voip_video_calls.html">video</a> chat service, but it also provides telephony (the paid Skype-out feature even allows you to call landline and cell phone numbers) and text-chat services. Until recently, <a href="http://www.pcworld.com/article/189459/skype_on_verizon_smartphones_the_good_the_bad.html">Verizon</a> stood out as the only carrier to allow Skype calls on its network. That has now changed--somewhat--with the introduction of the Skype app for Android 2.1 and above.
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