Unlike other screen protectors purchased in the past, these did not come with a plastic frame to properly align the protector on the screen. Consequently, they are fiddly and difficult to fit. First attempt resulted in a bubble and dust particle which were difficult to remove. It is important to clean and dry the screen thoroughly. I used tape to ensure the screen was aligned with the protector before fitting. But it's much easier if you have a plastic frame which fits around the phone, with an opening exactly fitted to the protector. There is another brand on Amazon which has this frame.