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Mophie juice pack iphone 4 cover - another iPhone 4 accessory - which doubles the battery of much popular smartphone. Mophie has already made iPhone and other cell phone cases which are perfect for extended battery life and also for the skin protection of iPad, iPod Touch, iPhone 3G and iPhone 3GS. This mophie juice and battery pack have been designed for iPhone 4 so that it work perfectly well and to get rid of any reception issues.