4. Espier Screen Locker 7 (alternative)
This free, simple and easy-to-use but beautiful iPhone app for Android, offers a unique style of iOS 7 to lock and unlock the screen of a Smartphone. A dedicated unlock slip feature is also offered, with the option of setting a device administrator password for maximum security. Espier Screen Locker 7 (Alternative) also allows you to display real-time notifications on the screen when gadgets are locked for easy interaction.