The option to import your contacts from your SIM card will be given to you when you first access the People app on your Nokia Lumia 820.
But if you want to import your contacts at a later date, you can do this via the following steps:
- From the Start screen, swipe to the left.
- Scroll down to and tap People.
- Tap the more icon.
- Tap settings.
- Tap import SIM contacts.
- Select the required contacts, then tap import.
That's it - all the contacts on your SIM have been successfully imported to your Nokia Lumia 820's handset memory.