Important User Information; Introduction; Deactivating/Activating The Efr Codec - Nokia 3310 User Manual

Important User Information

This section explains how to
deactivate the EFR CODEC should you
find that it is difficult to make or
receive calls when travelling and
roaming onto another network.

Introduction

The Nokia 3310 (GSM) comes
equipped the latest codec and audio
technology for superior sound and
voice quality.
Currently, there are three different
codecs defined for GSM/PCN:
• full-rate (FR)
• enhanced full-rate (EFR)
• half-rate (HR)
The Nokia 3310 phone can support all
these codecs.
The FR codec is supported by all GSM
and PCN cellular networks and
phones.
The network automatically selects
which codec is used, FR or EFR (if
supported by the network).
The Nokia phone supplied within this
sales package has the EFR codec
activated to so that you can
automatically enjoy the benefits of E
FR if supported by your network
operator. Currently only some
networks support the EFR codec in
addition to the FR codec.
Important User Information
Deactivating/Activating
The EFR Codec
The Nokia N3310 fully meet and
comply with all EFR codec and
relevant compatibility specifications.
However, as a result of some networks
not yet complying with the latest
specifications you may find it
impossible to make or receive calls, if
the EFR codec is activated, e.g. when
you are visiting or roaming in a
foreign network.
If problems are encountered in
making a call (with the display of
"Check operator services" or another
similar message), OR receiving calls,
deactivating the EFR codec may
resolve the problem. To deactivate or
reactivate the EFR codec follow the
instructions given in the next section.
Please note that there is no indication
on the phone as to whether or not the
EFR codec is activated or deactivated.
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