Here's how to make a call to an existing contact on your Nokia Lumia 820:
From the start screen, tap the Phone tile. (If you've previously removed the Phone tile from your phone's Home screen, swipe to the right, scroll to and tap Phone.)
- To enter a number manually tap the keypad icon. Otherwise, tap the contacts icon to select an existing contact.
- Tap the required contact.
- Tap the required call number.
Your call will now be connected.
To hang up, tap end call.
Your call will now be disconnected.