123Note: If a device uses multiple enabled administrationapplications, the strictest policy is enforced.1. From the Home screen, tap ➔ Settings ➔Security.2. Tap Device administrators.3. Select a device administrator and follow the prompts. Ifno device administrators are listed, you can downloadthem from the Play Store.Unknown sourcesThis feature allows you to download and install non-Marketapplications.1. From the Home screen, tap ➔ Settings ➔Security.2. Tap Unknown sources.A check mark is displayed to indicate it is active.Warning! Enabling this option causes your phone and personaldata to be more vulnerable to attack by applicationsfrom unknown sources.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 Home screen, tap ➔ Settings ➔Security.2. Tap 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. Tap a CA certificate to examine its details.A scrolling screen displays the details.4. Scroll to the bottom of the details screen and tapDisable to disable a System certificate or Remove toremove a User certificate.
