Sony Ericsson T628, T630 manual SIM application toolkit, Fixed dialling and Restricted calls

For Mobile Originated SMS, an SMS message is sent from a Mobile Station to the SMS-C where it is forwarded to its destination. This can be another Mobile Station, or a terminal in the fixed network.

A Mobile Terminated SMS is when an SMS mes- sage is forwarded from the SMS-C to a Mobile Sta- tion. When the Mobile Station receives the message, it returns a delivery report saying the transfer was successful.

White Paper T630/T628

Fixed dialling and Restricted calls

For a company or an organization, it can be useful to restrict phone calls. Fixed Dialling allows the user to preset a number of digits, for example area codes. This restricts the user to making calls only to numbers which use the preset digits as leading digits. Fixed Dialling makes use of the PIN2, and it requires fixed dial fields on the SIM card.

The Restrict Calls service allows the user to block outgoing or incoming calls in certain situations, for example international calls.

SIM application toolkit

The SIM Application Toolkit (SIM AT) is a smart card-centric method of deploying programs that apply only to GSM and to SMS and USSD trans- ports. Programs must be distributed on smart cards. For an operator, a company or service pro- vider, SIM AT offers a powerful way to deploy pro- grams and services to users, without the need for new or upgraded equipment. All necessary setup and programming is distributed to users over the air, directly to their phones. In the T630/T628, a separate menu is available for functions residing on the SIM card. These can include submenus for controlling functions, and also functions which allow the phone to initiate calls, send data, and dis- play information to the user.

45 October 2003