Holding your credit or debit cards in an iPhone wallet case should not damage the cards.
if it is broken, replace it. any damage part of iphone can be replaced.
No
No
They can damage your eyes , but not effected
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No, it is just a theory.
iPhone 4 Mic's are typically damaged from moisture or liquid damage. This can be repaired.
No, the iPhone 4 is not waterproof, but there are cases made which can help protect the phone from water damage.
iphone with a purple case with eyes on it
Like all shampoo it will sting a bit, but if you wash it out of your eyes right away it will do no damage.
If you want to really damage your eyes then you better look directly at the sun. This is the perfect way to do it. But I would suggest that it is not safe to do. Take care of your beautiful eyes.