We bought a phone (clamshell) for my grandmother, at home we found that the back cover comes off when closed with one finger. They were sent to the unified service center for verification. The answer came: "Mechanical damage to the case has been detected. The warranty conditions are not met, the refusal to carry out repairs on the terms of warranty service." Although there is no damage on the case, as well as scratches. According to them, we tried to tear off the lid from behind with our hands.