Nokia 7710 manual Sending Dtmf tones, Network, Security

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 Default to activate the group agreed on with the network operator. Select On 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.

Telephone

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