D a t a m a n a g e m e n t
Data management
Install or remove applications
You can install two types of applications to your device:
•J2METM applications based on JavaTM technology with the extension .jad or .jar. PersonalJavaTM applications cannot be installed on your device.
•Other applications and software suitable for the Symbian operating system. The installation files have the .sis or .sisx extension. Only install software specifically designed for your device.
Important: Only install and use applications and other software from trusted sources, such as applications that are Symbian Signed or have passed the Java VerifiedTM testing.
Important: Even if the use of certificates makes the risks involved in remote connections and software installation considerably smaller, they must be used correctly in order to benefit from increased security. The existence of a certificate does not offer any protection by itself; the certificate manager must contain correct, authentic, or trusted certificates for increased
security to be available. Certificates have a restricted lifetime. If "Expired certificate" or "Certificate not valid yet" is shown, even if the certificate should be valid, check that the current date and time in your device are correct.
Before changing any certificate settings, you must make sure that you really trust the owner of the certificate and that the certificate really belongs to the listed owner.
Installation files may be transferred to your device from a compatible computer, downloaded during browsing, or sent to you in a multimedia message, as an
To find installed applications, select 
> Applications > My own. My own is the default folder for installed applications. However, applications may also be installed in the Internet or Games folders.
To open Application manager, select 
> Settings > Data mgr. > App. mgr..