Flygrip Smartphone Holder
This neatly designed gripping device, which attaches easily to the back of most smartphones or their cases, allows you to use your phone one-handed without cramping your hand. The Flygrip sticks onto the back of the phone or the phone's case.
Then you simply flip the Flygrip open and use two fingers to hold the grip's lever. This leaves you with full use of your thumb to maneuver around the screen. You can also prop your phone up using the Flygrip as a kickstand in either portrait or landscape mode.