172Unknown SourcesThis feature allows you to download and install non-Marketapplications.1. From the Settings screen, touch More ➔Security.2. Touch Unknown sources.When enabled, a check mark appears in thecheck box.Warning! Enabling this option causes your phone and personaldata to be more vulnerable to attack by applicationsfrom unknown sources.Verify AppsThis feature allows you to either block or warn you beforeinstalling apps that may cause harm to your phone.1. From the Settings screen, touch More ➔Security.2. Touch Verify apps.When enabled, a check mark appears in thecheck box.Trusted CredentialsIf a certificate authority (CA) certificate gets compromised orfor some other reason you do not trust it, you can disable orremove it.1. From the Settings screen, touch More ➔Security.2. Touch Trusted credentials.The trusted credentials screen has two tabs:• System: Displays CA certificates that are permanently installedin the ROM of your device.• User: Displays any CA certificates that you installed, forexample, in the process of installing a client certificate.3. Touch a CA certificate to examine its details.A scrolling screen displays the details.4. Scroll to the bottom of the details screen and touchTurn off to disable a System certificate.Caution! When you disable a system CA certificate, theTurn off button changes to Turn on, so you can enablethe certificate again, if necessary.
