So you are worried about dropping your smartphone by accident? C-Safe is a magnetic lock that helps you avoid that. It physically locks your phone to your pocket, making it harder for pickpockets to steal your smartphone. It is installed in your pocket by clamping to the fabric. C-Safe can be used in pants, bags, jackets, and even backpacks.
You can adjust the angle of release in your pocket. That means only you can remove your phone easily. C-Safe is available for pre-order on Kickstarter.