Do I need a screen protector on iPhone 4s if I'm using a case?

I'm using the otterbox commuter case for the iPhone 4s. Do I need a screen protector?

If that case is adding layer to your screen then I don't think you do. But if its only covering the back and the side then it would be good to have you screen protected.

Up to you…

Without screen protector dust and grit can still get on the screen and potentially scratch it but the case does prevent damage from inside your pocket or bag.

But with a screen protector the screen qualilty decreases slightly especially with cheapers ones and they scratch easily as well making the screen looks even worse.

Nope, you do not need