Sony Ericsson P800 Betriebsanweisung

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P800/P802 
White Paper, January 2003 
108
SIM Application Toolkit  
 
SIM Application Toolkit (SIM-AT) is a method of developing small applications for mobile phones. 
User interaction is via the screen and keyboard, whilst connectivity is provided by means of SMS 
and USSD transports. SIM-AT can also be used to initiate phone calls. A typical application is to 
provide a simple menu-based interface to value-added services provided by the mobile operator. 
The application is stored and distributed on the SIM card. SIM-AT offers a powerful way to deploy 
programs and services to users, without the need for new or upgraded equipment. All necessary 
set-up and programming is distributed to users over the air, directly to their phones. 
 
The P800 supports SIM-AT according to GSM 11.14 in order to protect investment in SIM-AT 
based applications and to enable users to continue using the services and applications on their 
SIM cards. The applications are accessed from within the UI of the P800’s Phone application. 
 
The P800 also has much richer application environments including WAP, Web, C++ and Java. 
These enable applications to be created with a much better UI and superior connectivity such as 
TCP/IP over the internet. 
 
SIM-AT Services supported by the P800 
 
Service Description 
 
CALL CONTROL 
This will enable the SIM to allow, bar or modify a call 
(supplementary service operation or USSD operation). 
 
DISPLAY TEXT 
Text is displayed on the screen according to the request from the 
SIM application: 
Priority:  
Normal, High 
Clear Message: Automatic after delay, Wait for user. 
Alphabet: 
UCS2, packed and unpacked SMS default 
 
EVENT DOWNLOAD 
The Event Download enables the ME to report on events to the 
SIM: 
•  Location Status  
•  Idle Screen Available  
•  Language Selection     
•  Call Connected 
•  Call Disconnected 
•  Browser Termination 
 
GET INKEY 
Request the user to enter a single character. 
•  0-9 *# + only or alphabet set 
•  Yes/No Response 
•  SMS default or UCS2 character set 
 
GET INPUT 
Request the user to enter a number of characters. 
•  0-9 *# + only or alphabet set 
•  SMS default or UCS2 character set 
•  Input echoed or secret 
•  Packed or unpacked. 
 
 
LAUNCH BROWSER 
The P800 will launch the integrated browser.