Nokia 5170 - Manual (Page 47)

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Off turns off touch tones. No tones are sent when you press
the keys.
Setting automatic touch tone length
Use Menu 4 2 1 2 to set the length of touch tones sent
automatically by the phone to Short (one tenth of a second)
or Long (half a second).
Saving touch tone strings
Touch tone strings can be used for sending and receiving
information with your phone. Save touch tone strings the
same way you save phone numbers (see ‘Saving names and
numbers’ on page 19).
For example, you can save your office voice mailbox number
along with your password for easy access to your messages
(see ‘Special characters in phone numbers’ on page 12).
Sending touch tone strings
1 During a call, press to clear any numbers from the
screen.
2 Press Options.
3 Scroll to Touch tones, then press OK.
4 Enter or find the touch tone string, then press OK.
Restore factory settings
You can use Menu 4 2 2 to reset many of the settings in
your phone to their factory defaults (as in a new phone).
You are required to enter the security code.
Note: The phone book, language setting, call timers, security
code, and lock code are not affected.