有什么方法可以监视Windows Phone 7上的电话信息？

Question

I know you can make a call using PhoneCallTask, but is there any way to trigger an action while making the phone call?

For example, set a timer and make a sound when it's been 1 or 2 minutes on the call.

Answer 1

No, applications are not allowed access to the phone directly.

The only access your application has with the core phone features is via Launchers and Choosers. See MSDN:

http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff769556(v=vs.92).aspx