Do I need a case if I use screen protectors for iphone?

I never drop electronic devices. But would it be a better idea to use screen protectors on both sides and a bumper case or a case with screen protector on the front?

Do you mean the insivishields or case of some sort? I had did have the invisashield which I have on all my smart phones. It's very nice to have. However, I ran into an issue with my keyboard and case. Where it rests in the case, it started to cause bubbles on my invisishield.So, I returned it.
If I didn't have a case and keyboard that messed with it, I would strongly recommend it. Prevents scratches and althought doesn't make is smudge proof, it does cut down on it much.

Use the otterbox or the Griffin Survivor case, its protect the phone as a whole.http://www.onecase.co.uk/griffin-survivor-case-for-iphone-4-4s-camo.html

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