Forum Xamarin.Android

Background outgoing Call listener

Hi to everybody, I´m total new with Xamarin and I would like to start with following app.

I want to listen for outgoing call of telephone.
On call end resume the telephone number and time of call.
Send a message to the user with Toast.
Write this data in a file.
The app must work in background.

Somebody can give to me some tips of what approach I can use end where I can found some tips and examples to do it ?

Many thank for help.

Piercarlo

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