It is not possible to access information about missed or dialed calls in Windows Phone 7. For security reasons, any application that you write is essentially isolated from user data, such as phone numbers, unless the user provides it directly or through PhoneNumberChooserTask(or similar )
This was a deliberate design review for the first version of the SDK / API. It may or may not change in the future, no one speaks or cannot say for sure. But for now you can’t.
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