Lookout Premium is $4 monthly with the mobile security subscription or is free with your JUMP! subscription. The price gap between this and the standard Premium service is due to the difference in data backup storage. The $4 plan includes unlimited data backups (pictures, contacts, call logs); the standard Premium service has a data cap of 1.5GB.
For more information about Jump! and Mobile Security packages please visit: T-Mobile Jump! and Mobile Security packages