Smartphones are great for keeping in touch and keeping yourself entertained, until the battery dies. With the juice pack plus case from mophie, you can more than double the battery life in your iPhone 4. This protective case has a 2000mAh rechargeable battery, a charge indicator, and a standby/charge switch so you only use its battery when you need it. The juice pack plus hard-shell case has rubberized sides that look like Apple’s Bumper cases. They are available with a black back and cyan, yellow, black, magenta, and purple (limited edition of 3000) sides. You can charge and sync the iPhone 4 while it’s still in the mophie case. It acts as a virtual speaker box, redirecting the sound from the bottom of the phone to the front. Best of all, the mophie juice pack plus fits both the AT&T and Verizon versions of the iPhone 4. It’s available now for $99.95 from mophie.