General Tips
Shortcuts
In standby mode, press
or 
for the names and phone numbers saved in Contacts
to write a message
to access the Calendar
During a call, press to increase and to decrease the earpiece volume.
To open a connection to Internet quickly, press and hold 
in standby mode. Check the settings for browsing here.
Adjusting volume
If you want to adjust the volume during your phone conversation, press or .
Calling your voice mailbox
To call your voice mailbox (network service) in standby mode, press and hold 
, or press and 
.
Adding a voice mailbox number
Press Menu in standby mode, and select Messages and Voice messages. Select Voice mailbox number to save the number of your voice mailbox or Listen to voice messages to call it.
Diverting a call to a voice mailbox
If the Divert if busy function is activated to divert the calls, for example to your voice mailbox, rejecting an incoming call will also divert the call. You'll find call diverting from Settings > Call settings > Call divert.
Setting up speed dials
If you want to assign a number to one of the speed dial keys, select Contacts > Speed dials. You may assign a contact's phone number to keys 2 to 9. Key is reserved for the voice mailbox.
Accessing a menu function with a shortcut number
The menus, submenus and setting options are numbered. This shortcut number is shown at the top right of the display. Press Menu in standby mode. Within two seconds, key in the shortcut number of the main menu you want to open. Repeat this for the submenu and setting option.
Changing profiles
To change the profile quickly in standby mode, press the 
and select the profile you want to activate.
Quick save
In standby mode, enter the phone number. Press Options and select Save. Enter the name, press OK and Done.
Calling back
When a note about missed calls is displayed, press List to access the list of phone numbers. Scroll to the number you would like to call back and press .
Calling a recently dialed number
To redial one of the last ten phone numbers you have called or attempted to call, press once in standby mode, scroll to the phone number or name you want, and press .
Changing between lines
In standby mode you can switch from one line to the other by pressing and holding 
.
Currency conversion
You can also make currency conversions in standby mode. Enter the amount to be converted, press Options and select In domestic or In foreign.
Sending a business card
You can easily send a business card to another Nokia phone. Select the business card you want to send and press Details. Press Options and select Send bus. card > Via text message. Then enter the recipient's phone number and select OK.
Lock code
You can set a lock code to your phone to prevent unauthorized use of your phone. Select Tools > Settings > Security settings > Phone and SIM. The lock code contains five digits and the default setting is "12345".
Navigating in Calendar
To scroll day by day through the notes list, press or . To scroll note by note through the day notes, press or .
Keyguard
There’s an automatic keyguard in your Nokia 3120 phone. To activate the automatic keyguard, go to Settings > Phone settings > Automatic keyguard. You may also set the delay when the keyguard activates.
Keypad lock (Keyguard)
You can lock the keypad to prevent the keys from being pressed accidentally. To lock the keypad, press Menu in standby mode and then 
quickly.
Call summary
You can set your Nokia 3210 to show the duration of the phone call after you have ended the call. This is a very handy tool if you need to control your phone bills, for example. Go to Settings > Call settings > Summary after call and select On.
Version number of software
Enter *#0000# to your Nokia 3120 phone to get the version number of the device's software.