Help and How To : Phone

First and foremost, your Windows Phone is for making calls.

In addition to the basics, the following topics also cover more complicated calling scenarios, like participating in a conference call, or calling someone internationally.

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  Make and receive phone calls
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  Check my voicemail
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  Use my phone for confe

Post from : http://www.microsoft.com/windowsphone/en-us/howto/wp7/start/phone.aspx