Cell phones are always with us, everywhere. We can't even think of being separated from them. And accidents happen. Since smartphones are not so cheap and may contain data that is impossible to retrieve, we must protect them. Cracks caused by falls, bumps and scratches on the phone surface have become the nightmare of smartphone users.
So, the first reason to use a case, obviously, to prevent scratches and cracks. With a case you can use your phone longer without any damages. For overall device protection, a case which covers the corners, edges and back of a smartphone would be the best.
Second, depending on your choice of case there will be a place to put your credit cards within a card holder. You will be able to carry your wallet everywhere without carrying a wallet. You might also choose one to carry as purse or a crossbody. Cards, IDs, keys are all in a place with your phone and not so easy to leave them at home anymore.
Last but not least, make your phone distinguishable with variety of cases. It is an accessory to keep up with the latest fashion trends. The material, design and color will reflect on your personality.