Sending Dtmf Tones - Nokia 7710 User Manual

Line in use: (network service)- If your SIM card supports the
alternate line service, select the line you want to use.
Block line change: (network service) - If your SIM card
supports the alternate line service, and you select this
option, you cannot change the line in use. If you want to
change this setting, you must enter your PIN2 code.
Network page
Operator selection: - Allows you to change the way a
network is selected, and also to register to another
network. In automatic network selection, the smartphone
selects the most appropriate network. In manual network
selection, the smartphone searches for available networks
and presents you with a list of networks found. You can
then select which network to use. Note that the possibility
to change a network depends on your network operator.
Cell info display: - Select On to indicate that the smartphone
is used within a Micro Cellular Network. An indicator of
the MCN cell is shown in the phone number field. The
indicator is not shown during a call.
Security page
When security features that restrict calls are in use (such
as call barring, closed user group, and fixed dialing) calls
still may be possible to the official emergency number
programmed into your smartphone.
Closed user group: -Specify a group of people to whom you
can call and who can call you. Select
the group agreed on with the network operator. Select
to activate this network service. You must enter the group
number that you have obtained from the network.
Fixed dialling: - If your SIM card supports this service, you
can restrict your calls to a limited set of numbers stored in
the SIM card. When the fixed dialling service is active, the
SIM phone book list shows only numbers in the fixed
dialling list. You still have access to the Contacts directory,
but you cannot call those numbers.
If you want to change the settings or view the fixed
numbers, you are required to enter your PIN2 code. Select
Contacts to add, modify, or delete numbers.
You are required to enter names and numbers into the
fixed dialling list.
Note: Fixed dialling also affects service requests (also
known as SS and USSD commands), such as activation
commands for network services.

Sending DTMF tones

DTMF (Dual Tone Multi-Frequency) tones are the tones
you hear when you tap the number keys on the numeric
keypad of the Telephone application. For example, DTMF
tones allow you to communicate with voice mailboxes and
computerised telephony systems.
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