Some devices come with Lookout pre-installed from your carrier. It isn't possible to uninstall Lookout on these devices, but you can reset it if you need to.
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Go to the Google Play store. From the Menu, select "My apps and games"
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Select "Lookout Security & Antivirus" and click "Uninstall Updates." Note: If the option to "Uninstall Updates" does not exist, please go on to the next step
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Go to Android's Settings > Apps > Lookout. Choose "Force Stop" and then "Clear Data"
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Click the back button, and slide over to 'Running Services'. Select any Lookout services that may be running and click "Stop"
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Launch Lookout on your device and log into your existing account
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Return to the Google Play store and again select "My Apps" from the Menu.
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Select "Lookout Security & Antivirus" and click "Updates"