JVC KW-NT800HDT Manuel D'instructions page 107

Preset dial
Store phone numbers in preset dial in advance.
(☞ see below)
1
Press .
2
3
Select the number you want to dial.
Storing phone numbers in
preset dial
1
Press .
2
3
4
Select the button to store the number.
Using Bluetooth mobile phone
5
Press [ ](store from the phone book) or
[ ](store using the numeric keypad).
When you store from the phone book
Press the number to store in the preset dial.
When you store using the numeric keypad
Hold: Adds "+"
107
Delete selected preset dial
Press: Deletes last character
Hold: Deletes all characters