Find "Keypad"
Press Apps.
Press Phone.
Press the Keypad tab.
Assign contact to speed dialling key
Press the Menu key.
Speed dialling key 1 is for voicemail.
Press Speed dial setting.
Speed dialling key 1 is for voicemail.
Press the required speed dialling key.
Speed dialling key 1 is for voicemail.
Press the required contact.
Speed dialling key 1 is for voicemail.
Exit
Press the Home key to return to standby mode.