Do your homework
Read reviews of cell phone case you're interested. Even if you can not find a review for specific phone models, another review for the same producer will give a general sense of quality. You can also find people to talk about the case and posting their photos on the forum.
Particularly noteworthy is confirmed that the case has a precise cut-outs. Sometimes cases rushed out the door and they lose a port, button blankets rigid, or there is a problem with the camera flash reflection. If something like wireless charging is important to you, or you want to be able to dock your smartphone with the case, then check with the manufacturer before you buy.
Choose your features
Think about the additional features that you might want. For the case of tablets, landscape stand function can be vital. Some cases offer some positions or even 360 degree hinge. For a smartphone, you'll usually find Kickstands that pop out from behind, but make sure they are safe, because it can be annoying if they are popping up uninvited. Write down what you feel is important and saves it as a checklist while you shop.
How much protection do you need?
How clumsy are you? The first thing to work out is how hard you need your phone to be the case. If you want to be able to drop it into the concrete with impunity, or have survived sauce, then you'll need serious protection. If you're careful and you just want a basic protection, then you do not need to spend so much. There is a clear trade-off between the level of protection provided and the mass and the added weight.
Rugged phone case
At the top end in the safety stakes, you will find some serious cases of rough, but they will be big and heavy. The inclusion of air pockets and reinforced corners dramatically reduce the risk of damage to your device, but it certainly adds more bulk. They also must be easy to grip, even with wet hands, but you may find that it makes it more difficult to slide them in and out of the bag. You may need to buy a belt clip or holster to accommodate the larger case.