You cant do this using PhoneCallTask in Windows Phone

Today , i was trying to enable the call waiting feature using the Service Code *43# .

Read How to enable call waiting in Windows Phone 7 article ?

I was able to enable it by manually dialing the service code and tried to achieve the same via PhoneCallTask in Windows Phone .

Unluckily , i could not achieve it 🙁 …

My code looked like this ..

PhoneCallTask pCall = new PhoneCallTask();
pCall.PhoneNumber = "*43#";
pCall.Show();

when you run the Windows Phone App with the above code , you will see a dialog confirming to call the number and when you click call , you will end up getting the following error message .

Lesson learnt “You Cannot dial service codes programmatically” 🙁