Here is a Pip-Boy Model 3000 Mk IV replica that you can wear and pair with your smartphone to listen to music and take calls. Even when not paired with your phone, the device can serve as an alarm clock. Most of its knobs, dials, and buttons are functional.
The Pip-Boy Deluxe Bluetooth Edition weighs about 2 lbs. It has rechargeable batteries. The device is not a phone case and has a screen with on-board Pip-OS software. ThinkGeek is selling this for $349.99.