Abstract: A case for a mobile electronic device, such as a smartphone can be designed, for example, specifically for any version of the iPhone®. The case includes an elastic strap on the back side thereof to stabilize the device with one or more fingers while using it. The elastic strap may fit snuggly against the case when not in use, thereby not taking away from the slim form factor of the smartphone. A user can slide one or more fingers under the elastic strap on the back of the smartphone case to stabilize and secure the phone in the palm of the user, keeping the thumb free for typing. The elastic strap can pass through slots in the case and can be sewn together to form a loop or can include a hook on one end and a loop on another end to removably attach the elastic strap to the case.