Two problems occurred:
1. The films are a little too big (or exactly the size of the display surface) and thus allow no leeway in positioning. The first slide sticking minimal over the edge of the display (not the device) and also dissolved by a short time at this point.
2. the more serious problem: the proximity sensor of the display does not work anymore. As a result, the display no longer switches on when the phone takes away from the ear in conversation. The power and home button are not able to wake the display; you have to slide out the keyboard. The holes in the film are applied precisely over the sensors; afterwards I have been taking care. The second film brought no change here. Striking: the (supplied with the unit) original film has no holes, but is thinner.
Therefore, unfortunately, only two stars because the protection function is indeed given, as long as the film does not come off, but the function of the device is greatly impaired.