Skype the very popular VoIP service lets people make phone calls over the internet. Calls between two computers is free while calls to regular phones and other valued added services are charged to the user.
Skype is one of the poster boys for the freemium business model. It is a great way of showing how freemium can be used to successfully build a business.
Free
The ability to call for free between two computers
Premium
Calling landlines or mobile phones world wide (at a price that is much lower than normal phone charges)
Other value added services like Voicemail and Call Forwarding
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