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White Paper T310/T312
33 January 2003
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
transports. 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
centrally on web servers and downloaded as
required. While there is some overlap, WAP is a
particularly good choice when deploying programs
that also have an HTML version for desktop use.
Work is currently under way 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
programming is distributed to users over the air,
directly to their phones. In the T310/T312, a
separate menu is available for functions residing on
the SIM card. These can include sub menus for
controlling functions, and also functions which
allow the phone to initiate calls, send data, and
display information to the user.