Suggested Tip - Nokia 3310 User Manual

a) To deactivate the EFR CODEC
With the display clear perform the
following key press sequence:
#3370# or #EFR0#
i.e. press the "#" key, then the "3" key
and so on...
b) To activate the EFR CODEC
With the display clear perform the
following key press sequence:
*3370# or *EFR0#
i.e. press the "*" key, then the "3" key
and so on...
Notes to a) and b)
i) Immediately after pressing *3370#
(or #3370#) the phone will
automatically power itself off and
then on again - this is NORMAL and
also serves to indicate that
deactivation (or activation) has
occurred. During the automatic power
off/on sequence the LCD display will
become clear, the back lights will
switch off and then the display will
come back on.
ii) If during activation/deactivation
the wrong key is pressed, clear the
wrong entry by pressing the
iii) If at any time you choose to quit
the process then press and hold the
key.

Suggested Tip

you may wish to store the above
activation/deactivation sequences in
the phonebook.
Name:EFR ON
Number:*3370#
Name:EFR OFF
Number:#3370#
To save the activation sequence to the
phonebook, the name MUST be
entered first otherwise deactivation
or activation of the EFR codec will
occur.
key.
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