Mouaif ... A bit disappointed!

They are very difficult to implement, much more than on the Nexus 4.

In fact it is not really due to the protections in it ourselves (the product is very good) but rather the shape of the screen of the BlackBerry:
Indeed the Z10 there is a border around the screen slightly elevated, and you really apply the film to the millimeter against this border. Otherwise you'll have surprises once arrived down ... No margin of error is possible (on the Nexus 4 for example, the margin of error of one or two millimeters).

Attention also not to scratch protection with the credit card!

In short, I had to sacrifice one.

So I recommend a screen protector to position the conditions carefully.
PS: it is even possible to pick up the on error. But beware, dust can then drag either the protection or on the screen, the effect is then no longer guaranteed! But it remains possible (I did).