You are entitled to have up to five active devices associated with your Free or Premium Lookout account.
To add additional iOS devices:
1. Download the Lookout Mobile Security app from the Apple App Store
2. Once installed, open the Lookout app
3. Enter the email address of your existing account
To add additional Android devices:
1. Download the free Lookout Mobile Security app from the Google Play Store
2. After you have installed Lookout, open the app and login as an existing user with the "Already have an account? Sign in" option
3. Enter the email address of your existing account
Note: Premium status is tied to the Lookout account. So when you are activating the Lookout app on your phone make sure to enter the email address registered to your Premium Lookout account. Then your new device will show up on your existing account and the Premium features will activate immediately.