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If problems are encountered in making a call (with the<br />
display of "Check operator services" or another similar<br />
message), OR receiving calls, deactivating the EFR codec<br />
may resolve the problem. To deactivate or reactivate<br />
the EFR codec follow the instructions given in the<br />
next section.<br />
Please note that there is no indication on the phone as<br />
to whether or not the EFR codec is activated or deactivated.<br />
a) To deactivate the EFR CODEC<br />
With the display clear per<strong>for</strong>m the following key press<br />
sequence:<br />
#3370# or #EFR0#<br />
i.e. press the "#" key, then the "3" key and so on...<br />
b) To activate the EFR CODEC<br />
With the display clear per<strong>for</strong>m the following key press<br />
sequence:<br />
*3370# or *EFR0#<br />
i.e. press the "*" key, then the "3" key and so on...<br />
Notes to a) and b)<br />
i) Immediately after pressing *3370# (or #3370#) the<br />
phone will automatically power itself off and then on<br />
again - this is NORMAL and also serves to indicate that<br />
deactivation (or activation) has occurred. During the<br />
automatic power off/on sequence the LCD display will<br />
become clear, the back lights will switch off and then<br />
the display will come back on.<br />
ii) If during activation/deactivation the wrong key is<br />
pressed, clear the wrong entry by pressing the<br />
key.<br />
iii) If at any time you choose to quit the process then<br />
press and hold the key.<br />
3. Suggested Tip<br />
Reference In<strong>for</strong>mation<br />
you may wish to store the above activation/deactivation<br />
sequences in the phonebook.<br />
Name: EFR ON<br />
Number: *3370#<br />
Name: EFR OFF<br />
Number: #3370#<br />
To save the activation sequence to the phonebook, the<br />
name MUST be entered first otherwise deactivation or<br />
activation of the EFR codec will occur.<br />
Copyright © 2004 <strong>Nokia</strong>. All rights reserved. 37