The Computer Revolution/Communication/Skype
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Skype is an online telephone. It has all the features you can get with a regular phone, but it's online. In case you might be away Skype also has a built in messaging system to receive voicemail while you are away. Skype connects to computers, landlines or mobiles so you can reach anyone over their telephone line.
[edit] Costs
Money is involved with calling people on the phone and skype is no different. Currently they are offering free calling to landlines and mobiles within canada and the US, but that deal only lasts till 2006. Between other skype customers the calling is always free. There is also an option of video calls or group calls. The voicemail does cost money though, but for 1 year it will cost you $20 CDN to send and receive voicemail. Other costs include Inernational calls to landlines and mobiles, forwarding calls to phones, and SMS. Skype accepts payments through PayPal, certain credit cards, Moneybookers, or even withdraw the money for your own bank account.
[edit] Extras
With all the options Skype also offers products for you to purchase. There are headsets and handsets both wired and wireless. For those that wish to show themselves off there is an assortment of webcams with some that include Skype minutes when purchased through Skype's online market.