I’m an Iphone 4 user, and I don’t think a screen protector is necessary for Iphone because the screen of Iphone 4 itself is strong enough. However, I want to keep my Iphone 4 for a good resale value, I need to keep the screen unharmed. Then, I saw a protector from a new brand named ” Acase” which claims to have no bubbles at all. Therefore, I brought one to try it. After using this product, I’m really pleased and must recommend it to all of Iphone users. I promise you this is the best screen protector I’ve ever seen.