Keystone has rolled out its new ECO AmigoCase for the iPhone 4. Designed like a portable phone charging station, the AmigoCase consists of a protective cover for the iPhone and a battery pack, which features a built-in clip to let users attach it to clothing or a bag, slipping the phone back into the pack when not in use, while keeping it protected when it is in use. Features include an on/off switch for the battery pack, protection for the iPhone…
