The product should not be sold. The black line surrounding the glass "confuses" the proximity sensor of the phone, causing it to malfunction (not responding correctly, not ending calls, etc.). After days of experiencing problems, I searched for it online and saw that these screen protectors cause the issue. I removed it and replaced it with one without a black border, and the phone works fine now. I had bought two screen protectors. I threw away one, after all this, and requested a refund for the other one.