If you want a grippier phone case, there are a few things you can do. First, you can choose a case with a textured or matte finish. This will help to create more friction between your hand and the case. You can also look for cases with raised bumps or patterns, as these can also help to add grip. Another option is to purchase a case with rubberized sides or an attached grip accessory. These will both provide extra traction so you're less likely to drop your phone. Finally, make sure that the case fits snugly around your phone and isn't too loose. A tight fit will mean that there's less movement and therefore less chance of the phone slipping out of the case.