You can have your phone say which contact in your address book that is calling you. To set your phone to say the name of the contact, you need to save the contact in your address book.
Press Announce Calls.
Press Always to turn on the function when silent mode is turned off.
Press Headphones & Car to turn on the function when your phone is connected to a headset or a car.
Press Headphones Only to turn on the function when your phone is connected to a headset.
Press Never to turn off the function.
Press the Home key to return to the home screen.