The Nokia has a lighted number pad, and both the numbers and two vertical bars that run between the number keys illuminate white when you first wake up the phone from standby or press a key. The backlighting will turn off at the same time the screen backlight turns off to conserve power. The phone has keyguard, which you can activate by selecting Menu, then pressing the asterisk (*) key. You can turn off keyguard by selecting Unlock, then pressing the asterisk key, or simply by pressing the Talk button when a call comes in. Voice features include speed dialing, call waiting, caller ID, speakerphone, conference calling, SMS and MMS. The 6820 comes with 14 polyphonic (MIDI) ring tones (you can install more if you wish) and 8 color themes.

The phonebook can hold up to 500 entries, has speed dial, supports up to 10 voice dial numbers (you'll record your own voice tags), offers voice commands for up to 9 available menu items (5 active at the same time) and can record memos/conversations up to 90 seconds in duration. The unit has a call log that tracks missed calls, received calls and dialed calls. As you'd expect, you can dial using a call log entry, and reset the call log whenever you wish. The call log also tracks GPRS connection times and the amount of data transferred.