Putting directly: Assuming that I've Skype already installed in my OS, how can I launch a dialer from my app, with a given phone number passed as a parameter, from a Windows Phone? Thanks in advance.
As of last October 2014, the 2.24 release support Skype Uri's, and you can now launch Skype on Windows Phone 8.1 with skype://12345678?call
as uri (with 1234678
being the phone number)
See http://msdn.microsoft.com/en-us/library/office/dn745878(v=office.15).aspx for some documentation on the syntax.
(Disclaimer: I work on the Skype for Windows Phone team)
I don't believe you can. With Windows Phone you can use launchers which launch a predefined set of OS installed apps such as e-mail, maps, etc.
The closest you can get is using the phone call task.
Check: http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff769550(v=vs.105).aspx
Hope that helps. Inter-app communication isn't really there yet.
// Jed
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