Preliminary Layla850 P1B
Installing applications
It is possible to install new applications in your P910a. These applications can be obtained in several ways, for example:
•from the Internet.
•from a CD.
•from a Memory Stick.
•as an email attachment.
•from other devices.
There are two types of installation files for applications:
•SIS (Symbian Standard Installation) made for P910a or other Sony Ericsson devices.
•MIDP JAR (Mobile Information Device Profile Java Archive).
Note SIS and JAR files are installation packages containing one or more files.
Programs made for the Sony Ericsson P800 and P900 series can also be used in the P910a.
This chapter also applies to other types of software to install, for example, system components and
Applications from developers outside Sony Ericsson,
Applications which are not approved by Sony Ericsson are not guaranteed to work correctly or securely, and users install them at their own risk. Product failures caused by applications not approved or made for Sony Ericsson will not be covered by your warranty.
Installing applications on your P910a
Installation file security
Installation files in SIS format are typically used for installation of Epoc or PersonalJava™ applications or other content into the P910a file system.The vendor who prepared the SIS file decides where in the file system the various content of the SIS file will be installed. This means that you need to decide if you trust that the SIS file does not contain harmful content. If you are certain of the origin of the SIS file you can take an installation decision based on what you know about that vendor. Your P910a supports cryptographic verification of vendor identity.
During installation the P910a verifies a digital signature and certificate in the SIS file against a root certificate in the phone. Successful verification means that you can trust the origin of the
130 Installing applications
