***** DIAL AN EXTENSION AUTOMATICALLY with the Phone App
The Phone Number Pause feature in iPhone allows you to tell your iPhone to pause after calling a number and then dial another number. So, let’s say you are calling a friend in company “X.” The company telephone number is 123456 and your friend’s extension is 789. Using this option, iPhone will first dial 123456, pauses until the call is answered, and then dial 789 automatically.
To use this feature just tap and hold the star button ”*” after the first number. A comma will show up. Add the second number to dial after the pause.