Sony Ericsson Z300 manual SIM application toolkit, Interruption of Gprs data account

White Paper Z300

The GSM system limits the ability to use all eight time slots, so the Z300 uses up to four time slots for receiving data, and one slot for transmitting.

This means the speed for receiving data is up to 85,600 bps and up to 21,400 bps for sending data.

Using GPRS with the Z300 has several advantages, for example:

•Constant connection

•High speed

•Automatic access to increased bandwidth while downloading large files such as pictures and sounds

•Cost efficiency

•Use of transmission capacity only when needed to reduce cost

•WAP over GPRS

•Access to Internet via WAP at high speed and with a constant connection.

•Provide settings

•Receive GPRS configuration settings from the provider over the air, OTA, making manual con- figuration unnecessary.

•User controlled settings

•Take advantage of full user control in the data connections menu, establishing multiple descriptions and accessing advanced settings for GPRS.

Interruption of GPRS data account

When the user is using WAP via GPRS on the Z300, the GPRS connection is automatically dis- connected when the user answers an incoming call. However, when the call has ended, the user is given the possibility to resume the WAP session.

SIM application toolkit

The SIM Application Toolkit (SIM AT) is a smart card-centric method of deploying programs that applies only to GSM and to SMS and USSD trans- ports. Programs must be distributed on smart cards. WAP is an Internet-centric method of deploying programs that is independent of network technology. Programs and content are kept cen- trally on web servers and downloaded as required. While there is some overlap, WAP is a particularly good choice while deploying programs that also have an HTML version for desktop use. Work is currently underway on building interfaces between the two technologies.

For an operator, a company or service provider, SIM AT offers a powerful way to deploy programs and services to users, without the need for new or upgraded equipment. All necessary setup and pro- gramming is distributed to users over the air, directly to their phones. In the Z300, a separate menu is available for functions residing on the SIM card. These can include submenus for controlling functions, and also functions that allow the phone to initiate calls, send data, and display information to the user.

20 October 2005