Tools• Other applications and software suitable for theSymbian operating system ( ). The installation fileshave the SIS extension. Only install softwarespecifically designed for your Nokia 6680 device.Installation files may be transferred to your phone from acompatible computer, downloaded during browsing, orsent to you in a multimedia message, as an e-mailattachment, or using a Bluetooth connection. You can useNokia Application Installer in Nokia PC Suite to install anapplication to your phone or a memory card. If you useMicrosoft Windows Explorer to transfer a file, save the fileto a memory card (local disk).Install applications and softwareApplication icons are as follows:SIS applicationTo view the application type, version number, and thesupplier or manufacturer of the application, selectOptions > View details.To display the security certificate details of the application,select Options > View certificate. See "Certificatemanagement" on page 99.If you install a file that contains an update or repair to anexisting application, you can only restore the originalapplication if you have the original installation file or a fullback-up copy of the removed software package. To restorethe original application, remove the application, and installthe application again from the original installation file orthe backup copy.Tip! You can also use Nokia Application Installeravailable in Nokia PC Suite to install applications.See the CD-ROM supplied with the phone.